diff --git a/fixtures/vcr_cassettes/GMO_Payment_RemittanceAPI/_cancel_deposit_gets_data_about_a_deposit.yml b/fixtures/vcr_cassettes/GMO_Payment_RemittanceAPI/_cancel_deposit_gets_data_about_a_deposit.yml
index ac74812..e0995fb 100644
--- a/fixtures/vcr_cassettes/GMO_Payment_RemittanceAPI/_cancel_deposit_gets_data_about_a_deposit.yml
+++ b/fixtures/vcr_cassettes/GMO_Payment_RemittanceAPI/_cancel_deposit_gets_data_about_a_deposit.yml
@@ -4,7 +4,7 @@ http_interactions:
     method: post
     uri: https://<REMITTANCE_HOST>/api/DepositRegistration.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: Bank_ID=bank0000<SHOP_PASS>&Deposit_ID=dep0000<SHOP_PASS>&Method=2&Shop_ID=<REMITTANCE_SHOP_ID>&Shop_Pass=<REMITTANCE_SHOP_PASS>
     headers:
       Accept-Encoding:
@@ -31,7 +31,7 @@ http_interactions:
       X-Frame-Options:
       - SAMEORIGIN
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: Deposit_ID=dep00001&Bank_ID=bank00001&Method=2
     http_version:
   recorded_at: Mon, 01 May 2017 05:58:24 GMT
diff --git a/fixtures/vcr_cassettes/GMO_Payment_RemittanceAPI/_cancel_mail_deposit_gets_data_about_a_mail_deposit.yml b/fixtures/vcr_cassettes/GMO_Payment_RemittanceAPI/_cancel_mail_deposit_gets_data_about_a_mail_deposit.yml
index 028741e..206ca76 100644
--- a/fixtures/vcr_cassettes/GMO_Payment_RemittanceAPI/_cancel_mail_deposit_gets_data_about_a_mail_deposit.yml
+++ b/fixtures/vcr_cassettes/GMO_Payment_RemittanceAPI/_cancel_mail_deposit_gets_data_about_a_mail_deposit.yml
@@ -4,7 +4,7 @@ http_interactions:
     method: post
     uri: https://<REMITTANCE_HOST>/api/MailDepositRegistration.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: Deposit_ID=dep0000<SHOP_PASS>&Method=2&Shop_ID=<REMITTANCE_SHOP_ID>&Shop_Pass=<REMITTANCE_SHOP_PASS>
     headers:
       Accept-Encoding:
@@ -31,7 +31,7 @@ http_interactions:
       X-Frame-Options:
       - SAMEORIGIN
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: Deposit_ID=dep00001&Method=2
     http_version:
   recorded_at: Mon, 01 May 2017 05:58:28 GMT
diff --git a/fixtures/vcr_cassettes/GMO_Payment_RemittanceAPI/_create_account_gets_data_about_an_account.yml b/fixtures/vcr_cassettes/GMO_Payment_RemittanceAPI/_create_account_gets_data_about_an_account.yml
index a4e06be..86ab36e 100644
--- a/fixtures/vcr_cassettes/GMO_Payment_RemittanceAPI/_create_account_gets_data_about_an_account.yml
+++ b/fixtures/vcr_cassettes/GMO_Payment_RemittanceAPI/_create_account_gets_data_about_an_account.yml
@@ -4,7 +4,7 @@ http_interactions:
     method: post
     uri: https://<REMITTANCE_HOST>/api/AccountRegistration.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: Bank_ID=bank0000<SHOP_PASS>&Bank_Code=000<SHOP_PASS>&Branch_Code=8<SHOP_PASS>3&Account_Type=<SHOP_PASS>&Account_Name=An+Yutzy&Account_Number=00<SHOP_PASS>2345&Branch_Code_Jpbank=00567&Account_Number_Jpbank=0<SHOP_PASS>234567&Free=foobar&Method=<SHOP_PASS>&Shop_ID=<REMITTANCE_SHOP_ID>&Shop_Pass=<REMITTANCE_SHOP_PASS>
     headers:
       Accept-Encoding:
@@ -31,7 +31,7 @@ http_interactions:
       X-Frame-Options:
       - SAMEORIGIN
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: Bank_ID=bank00001&Method=1
     http_version:
   recorded_at: Mon, 01 May 2017 05:58:18 GMT
diff --git a/fixtures/vcr_cassettes/GMO_Payment_RemittanceAPI/_create_deposit_gets_data_about_a_deposit.yml b/fixtures/vcr_cassettes/GMO_Payment_RemittanceAPI/_create_deposit_gets_data_about_a_deposit.yml
index 153562b..61767af 100644
--- a/fixtures/vcr_cassettes/GMO_Payment_RemittanceAPI/_create_deposit_gets_data_about_a_deposit.yml
+++ b/fixtures/vcr_cassettes/GMO_Payment_RemittanceAPI/_create_deposit_gets_data_about_a_deposit.yml
@@ -4,7 +4,7 @@ http_interactions:
     method: post
     uri: https://<REMITTANCE_HOST>/api/DepositRegistration.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: Bank_ID=bank0000<SHOP_PASS>&Deposit_ID=dep0000<SHOP_PASS>&Amount=<SHOP_PASS>000&Method=<SHOP_PASS>&Shop_ID=<REMITTANCE_SHOP_ID>&Shop_Pass=<REMITTANCE_SHOP_PASS>
     headers:
       Accept-Encoding:
@@ -31,7 +31,7 @@ http_interactions:
       X-Frame-Options:
       - SAMEORIGIN
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: Deposit_ID=dep00000&Bank_ID=bank00000&Method=1&Amount=1000&Bank_Fee=27
     http_version:
   recorded_at: Mon, 01 May 2017 05:58:23 GMT
diff --git a/fixtures/vcr_cassettes/GMO_Payment_RemittanceAPI/_create_mail_deposit_gets_data_about_a_mail_deposit.yml b/fixtures/vcr_cassettes/GMO_Payment_RemittanceAPI/_create_mail_deposit_gets_data_about_a_mail_deposit.yml
index b4ee4be..7492678 100644
--- a/fixtures/vcr_cassettes/GMO_Payment_RemittanceAPI/_create_mail_deposit_gets_data_about_a_mail_deposit.yml
+++ b/fixtures/vcr_cassettes/GMO_Payment_RemittanceAPI/_create_mail_deposit_gets_data_about_a_mail_deposit.yml
@@ -4,7 +4,7 @@ http_interactions:
     method: post
     uri: https://<REMITTANCE_HOST>/api/MailDepositRegistration.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: Deposit_ID=dep0000<SHOP_PASS>&Mail_Address=anyutzy%40demo.com&Amount=<SHOP_PASS>000&Mail_Deposit_Account_Name=An+Yutzy&Expire=5&Shop_Mail_Address=anyutzy%40demo.com&Method=<SHOP_PASS>&Shop_ID=<REMITTANCE_SHOP_ID>&Shop_Pass=<REMITTANCE_SHOP_PASS>
     headers:
       Accept-Encoding:
@@ -31,7 +31,7 @@ http_interactions:
       X-Frame-Options:
       - SAMEORIGIN
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: Deposit_ID=dep00001&Method=1&Amount=1000&Expire=20170503
     http_version:
   recorded_at: Mon, 01 May 2017 05:58:27 GMT
diff --git a/fixtures/vcr_cassettes/GMO_Payment_RemittanceAPI/_delete_account_gets_data_about_an_account.yml b/fixtures/vcr_cassettes/GMO_Payment_RemittanceAPI/_delete_account_gets_data_about_an_account.yml
index a8588a6..770f9fa 100644
--- a/fixtures/vcr_cassettes/GMO_Payment_RemittanceAPI/_delete_account_gets_data_about_an_account.yml
+++ b/fixtures/vcr_cassettes/GMO_Payment_RemittanceAPI/_delete_account_gets_data_about_an_account.yml
@@ -4,7 +4,7 @@ http_interactions:
     method: post
     uri: https://<REMITTANCE_HOST>/api/AccountRegistration.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: Bank_ID=bank0000<SHOP_PASS>&Method=3&Shop_ID=<REMITTANCE_SHOP_ID>&Shop_Pass=<REMITTANCE_SHOP_PASS>
     headers:
       Accept-Encoding:
@@ -31,7 +31,7 @@ http_interactions:
       X-Frame-Options:
       - SAMEORIGIN
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: Bank_ID=bank00001&Method=3
     http_version:
   recorded_at: Mon, 01 May 2017 05:58:20 GMT
diff --git a/fixtures/vcr_cassettes/GMO_Payment_RemittanceAPI/_search_account_gets_data_about_an_account.yml b/fixtures/vcr_cassettes/GMO_Payment_RemittanceAPI/_search_account_gets_data_about_an_account.yml
index e3eee6b..fddbb39 100644
--- a/fixtures/vcr_cassettes/GMO_Payment_RemittanceAPI/_search_account_gets_data_about_an_account.yml
+++ b/fixtures/vcr_cassettes/GMO_Payment_RemittanceAPI/_search_account_gets_data_about_an_account.yml
@@ -4,7 +4,7 @@ http_interactions:
     method: post
     uri: https://<REMITTANCE_HOST>/api/AccountSearch.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: Bank_ID=bank0000<SHOP_PASS>&Shop_ID=<REMITTANCE_SHOP_ID>&Shop_Pass=<REMITTANCE_SHOP_PASS>
     headers:
       Accept-Encoding:
@@ -31,7 +31,7 @@ http_interactions:
       X-Frame-Options:
       - SAMEORIGIN
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: Bank_ID=bank12345&Delete_Flag=0&Bank_Name=みずほ銀行&Bank_Code=0001&Branch_Name=札幌支店&Branch_Code=813&Account_Type=1&Account_Number=0012345&Account_Name=An Yutzy&Free=&Branch_Code_Jpbank=&Account_Number_Jpbank=
     http_version:
   recorded_at: Mon, 01 May 2017 05:58:21 GMT
diff --git a/fixtures/vcr_cassettes/GMO_Payment_RemittanceAPI/_search_balance_gets_data_about_balance.yml b/fixtures/vcr_cassettes/GMO_Payment_RemittanceAPI/_search_balance_gets_data_about_balance.yml
index 2864497..f8adab2 100644
--- a/fixtures/vcr_cassettes/GMO_Payment_RemittanceAPI/_search_balance_gets_data_about_balance.yml
+++ b/fixtures/vcr_cassettes/GMO_Payment_RemittanceAPI/_search_balance_gets_data_about_balance.yml
@@ -4,7 +4,7 @@ http_interactions:
     method: post
     uri: https://<REMITTANCE_HOST>/api/BalanceSearch.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: Shop_ID=<REMITTANCE_SHOP_ID>&Shop_Pass=<REMITTANCE_SHOP_PASS>
     headers:
       Accept-Encoding:
@@ -31,7 +31,7 @@ http_interactions:
       X-Frame-Options:
       - SAMEORIGIN
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: Shop_ID=rshop00000071&Balance=9818965&Balance_Forecast=9818965
     http_version:
   recorded_at: Mon, 01 May 2017 05:58:26 GMT
diff --git a/fixtures/vcr_cassettes/GMO_Payment_RemittanceAPI/_search_deposit_gets_data_about_a_deposit.yml b/fixtures/vcr_cassettes/GMO_Payment_RemittanceAPI/_search_deposit_gets_data_about_a_deposit.yml
index e98c228..c6f09f5 100644
--- a/fixtures/vcr_cassettes/GMO_Payment_RemittanceAPI/_search_deposit_gets_data_about_a_deposit.yml
+++ b/fixtures/vcr_cassettes/GMO_Payment_RemittanceAPI/_search_deposit_gets_data_about_a_deposit.yml
@@ -4,7 +4,7 @@ http_interactions:
     method: post
     uri: https://<REMITTANCE_HOST>/api/DepositSearch.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: Deposit_ID=dep0000<SHOP_PASS>&Shop_ID=<REMITTANCE_SHOP_ID>&Shop_Pass=<REMITTANCE_SHOP_PASS>
     headers:
       Accept-Encoding:
@@ -31,7 +31,7 @@ http_interactions:
       X-Frame-Options:
       - SAMEORIGIN
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: Deposit_ID=dep00000&Bank_ID=bank163144&Bank_Name=みずほ銀行&Bank_Code=0001&Branch_Name=札幌支店&Branch_Code=813&Account_Type=1&Account_Number=0012345&Account_Name=An Yutzy&Free=&Amount=181035&Bank_Fee=270&Result=0&Branch_Code_Jpbank=&Account_Number_Jpbank=&Deposit_Date=&Result_Detail=
     http_version:
   recorded_at: Mon, 01 May 2017 05:58:25 GMT
diff --git a/fixtures/vcr_cassettes/GMO_Payment_RemittanceAPI/_search_mail_deposit_gets_data_about_a_mail_deposit.yml b/fixtures/vcr_cassettes/GMO_Payment_RemittanceAPI/_search_mail_deposit_gets_data_about_a_mail_deposit.yml
index f6540f9..434da25 100644
--- a/fixtures/vcr_cassettes/GMO_Payment_RemittanceAPI/_search_mail_deposit_gets_data_about_a_mail_deposit.yml
+++ b/fixtures/vcr_cassettes/GMO_Payment_RemittanceAPI/_search_mail_deposit_gets_data_about_a_mail_deposit.yml
@@ -4,7 +4,7 @@ http_interactions:
     method: post
     uri: https://<REMITTANCE_HOST>/api/MailDepositSearch.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: Deposit_ID=dep0000<SHOP_PASS>&Shop_ID=<REMITTANCE_SHOP_ID>&Shop_Pass=<REMITTANCE_SHOP_PASS>
     headers:
       Accept-Encoding:
@@ -31,7 +31,7 @@ http_interactions:
       X-Frame-Options:
       - SAMEORIGIN
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: Deposit_ID=dep00001&Mail_Address=anyutzy+test@demo.com&Shop_Mail_Address=anyutzy@demo.com&Account_Name=An Yutzy&Amount=1000&Expire=20170503&Status=0
     http_version:
   recorded_at: Mon, 01 May 2017 05:58:30 GMT
diff --git a/fixtures/vcr_cassettes/GMO_Payment_RemittanceAPI/_update_account_gets_data_about_an_account.yml b/fixtures/vcr_cassettes/GMO_Payment_RemittanceAPI/_update_account_gets_data_about_an_account.yml
index d3fe678..1a0c9f7 100644
--- a/fixtures/vcr_cassettes/GMO_Payment_RemittanceAPI/_update_account_gets_data_about_an_account.yml
+++ b/fixtures/vcr_cassettes/GMO_Payment_RemittanceAPI/_update_account_gets_data_about_an_account.yml
@@ -4,7 +4,7 @@ http_interactions:
     method: post
     uri: https://<REMITTANCE_HOST>/api/AccountRegistration.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: Bank_ID=bank0000<SHOP_PASS>&Bank_Code=000<SHOP_PASS>&Branch_Code=8<SHOP_PASS>3&Account_Type=<SHOP_PASS>&Account_Name=An+Yutzy&Account_Number=00<SHOP_PASS>2345&Branch_Code_Jpbank=00567&Account_Number_Jpbank=0<SHOP_PASS>234567&Free=foobar&Method=2&Shop_ID=<REMITTANCE_SHOP_ID>&Shop_Pass=<REMITTANCE_SHOP_PASS>
     headers:
       Accept-Encoding:
@@ -31,7 +31,7 @@ http_interactions:
       X-Frame-Options:
       - SAMEORIGIN
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: Bank_ID=bank00001&Method=2
     http_version:
   recorded_at: Mon, 01 May 2017 05:58:19 GMT
diff --git a/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_alter_tran_change_order_auth_to_sale.yml b/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_alter_tran_change_order_auth_to_sale.yml
index b556a29..7e5b573 100644
--- a/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_alter_tran_change_order_auth_to_sale.yml
+++ b/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_alter_tran_change_order_auth_to_sale.yml
@@ -4,7 +4,7 @@ http_interactions:
     method: post
     uri: https://<HOST>/payment/EntryTran.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: OrderID=1362106775&JobCd=AUTH&Amount=100&ShopID=<SHOP_ID>&ShopPass=<SHOP_PASS>
     headers:
       Accept:
@@ -33,7 +33,7 @@ http_interactions:
     method: post
     uri: https://<HOST>/payment/ExecTran.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: AccessID=675a12f12bb3bbf57aeb67acabfccecf&AccessPass=63144577f7f84c800fa2001cb7495f34&OrderID=1362106775&Method=1&PayTimes=1&CardNo=4111111111111111&Expire=1405&HttpAccept=null&HttpUserAgent=null&DeviceCategory=0&ClientField1=null&ClientField2=null&ClientField3=null&ClientFieldFlag=0&ShopID=<SHOP_ID>&ShopPass=<SHOP_PASS>
     headers:
       Accept:
@@ -62,7 +62,7 @@ http_interactions:
     method: post
     uri: https://<HOST>/payment/AlterTran.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: AccessID=675a12f12bb3bbf57aeb67acabfccecf&AccessPass=63144577f7f84c800fa2001cb7495f34&JobCd=SALES&Amount=100&ShopID=<SHOP_ID>&ShopPass=<SHOP_PASS>
     headers:
       Accept:
diff --git a/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_alter_tran_gets_data_about_order.yml b/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_alter_tran_gets_data_about_order.yml
index 3bc70a5..3c44533 100644
--- a/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_alter_tran_gets_data_about_order.yml
+++ b/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_alter_tran_gets_data_about_order.yml
@@ -4,7 +4,7 @@ http_interactions:
     method: post
     uri: https://<HOST>/payment/EntryTran.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: OrderID=1362106773&JobCd=AUTH&Amount=100&ShopID=<SHOP_ID>&ShopPass=<SHOP_PASS>
     headers:
       Accept:
@@ -33,7 +33,7 @@ http_interactions:
     method: post
     uri: https://<HOST>/payment/ExecTran.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: AccessID=f51483bb5892e25754eb85207a582b3c&AccessPass=07acabfd75965a1141fb9099080a8975&OrderID=1362106773&Method=1&PayTimes=1&CardNo=4111111111111111&Expire=1405&HttpAccept=null&HttpUserAgent=null&DeviceCategory=0&ClientField1=null&ClientField2=null&ClientField3=null&ClientFieldFlag=0&ShopID=<SHOP_ID>&ShopPass=<SHOP_PASS>
     headers:
       Accept:
@@ -62,7 +62,7 @@ http_interactions:
     method: post
     uri: https://<HOST>/payment/AlterTran.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: AccessID=f51483bb5892e25754eb85207a582b3c&AccessPass=07acabfd75965a1141fb9099080a8975&JobCd=RETURN&Amount=100&ShopID=<SHOP_ID>&ShopPass=<SHOP_PASS>
     headers:
       Accept:
diff --git a/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_alter_tran_got_error_if_missing_options.yml b/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_alter_tran_got_error_if_missing_options.yml
index 3566063..0112594 100644
--- a/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_alter_tran_got_error_if_missing_options.yml
+++ b/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_alter_tran_got_error_if_missing_options.yml
@@ -4,7 +4,7 @@ http_interactions:
     method: post
     uri: https://<HOST>/payment/AlterTran.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: AccessID=null&AccessPass=null&JobCd=SALES&Amount=null&ShopID=<SHOP_ID>&ShopPass=<SHOP_PASS>
     headers:
       Accept:
diff --git a/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_change_tran_brandtoken_gets_data_about_order.yml b/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_change_tran_brandtoken_gets_data_about_order.yml
index c7bfd76..9ed6c84 100644
--- a/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_change_tran_brandtoken_gets_data_about_order.yml
+++ b/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_change_tran_brandtoken_gets_data_about_order.yml
@@ -4,7 +4,7 @@ http_interactions:
     method: post
     uri: https://<HOST>/payment/EntryTranBrandtoken.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: OrderID=<SHOP_PASS>502<SHOP_PASS>889<SHOP_PASS>3&JobCd=AUTH&Amount=<SHOP_PASS>00&ShopID=<SHOP_ID>&ShopPass=<SHOP_PASS>
     headers:
       Accept-Encoding:
@@ -31,7 +31,7 @@ http_interactions:
       Content-Language:
       - ja-JP
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: AccessID=<SHOP_PASS>da06<SHOP_PASS>87345d6<SHOP_PASS>3ce206f4cd05bc5322&AccessPass=45a2<SHOP_PASS>e63323c3795d26e22338eaa6b7f
     http_version:
   recorded_at: Tue, 08 Aug 2017 10:41:55 GMT
@@ -39,7 +39,7 @@ http_interactions:
     method: post
     uri: https://<HOST>/payment/ExecTranBrandtoken.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: OrderID=<SHOP_PASS>502<SHOP_PASS>78987&AccessID=<SHOP_PASS>da06<SHOP_PASS>87345d6<SHOP_PASS>3ce206f4cd05bc5322&AccessPass=45a2<SHOP_PASS>e63323c3795d26e22338eaa6b7f&TokenType=APay&Token=base64encodedtoken&ClientField<SHOP_PASS>=client_field<SHOP_PASS>&ShopID=<SHOP_ID>&ShopPass=<SHOP_PASS>
     headers:
       Accept-Encoding:
@@ -66,7 +66,7 @@ http_interactions:
       Content-Language:
       - ja-JP
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: Status=AUTH&OrderID=597ae8c36<SHOP_PASS>20b23a3c000<SHOP_PASS>4e&Forward=2a99663&Approve=5487394&TranID=<SHOP_PASS>70728<SHOP_PASS>634<SHOP_PASS><SHOP_PASS><SHOP_PASS><SHOP_PASS><SHOP_PASS><SHOP_PASS><SHOP_PASS><SHOP_PASS><SHOP_PASS><SHOP_PASS><SHOP_PASS><SHOP_PASS>77<SHOP_PASS>2<SHOP_PASS>6&TranDate=20<SHOP_PASS>70728<SHOP_PASS>63453&ClientField<SHOP_PASS>=client_field<SHOP_PASS>&ClientField2=&ClientField3=
     http_version:
   recorded_at: Tue, 08 Aug 2017 07:56:28 GMT
@@ -74,7 +74,7 @@ http_interactions:
     method: post
     uri: https://<HOST>/payment/ChangeTranBrandtoken.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: OrderID=<SHOP_PASS>502<SHOP_PASS>89054&AccessID=<SHOP_PASS>da06<SHOP_PASS>87345d6<SHOP_PASS>3ce206f4cd05bc5322&AccessPass=45a2<SHOP_PASS>e63323c3795d26e22338eaa6b7f&JobCd=CAPTURE&Amount=<SHOP_PASS>500&ShopID=<SHOP_ID>&ShopPass=<SHOP_PASS>
     headers:
       Accept-Encoding:
@@ -101,7 +101,7 @@ http_interactions:
       Content-Language:
       - ja-JP
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: AccessID=21170701482c86c3b88ff72b83bfd363&AccessPass=51f36feba120de1e6e29532e5a3a5e3e&Status=CAPTURE&Forward=2a99663&Approve=5538477&TranID=1707311633111111111111771224&TranDate=20170731163343
     http_version:
   recorded_at: Tue, 08 Aug 2017 10:44:15 GMT
diff --git a/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_change_tran_gets_data_about_order.yml b/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_change_tran_gets_data_about_order.yml
index b166520..a83d0cc 100644
--- a/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_change_tran_gets_data_about_order.yml
+++ b/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_change_tran_gets_data_about_order.yml
@@ -4,7 +4,7 @@ http_interactions:
     method: post
     uri: https://<HOST>/payment/EntryTran.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: OrderID=1362106777&JobCd=AUTH&Amount=100&ShopID=<SHOP_ID>&ShopPass=<SHOP_PASS>
     headers:
       Accept:
@@ -33,7 +33,7 @@ http_interactions:
     method: post
     uri: https://<HOST>/payment/ExecTran.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: AccessID=53423389f2059b97ab86faa87ccf5ebc&AccessPass=7e0c971d8b63bd6924f88caec7dd056a&OrderID=1362106777&Method=1&PayTimes=1&CardNo=4111111111111111&Expire=1405&HttpAccept=null&HttpUserAgent=null&DeviceCategory=0&ClientField1=null&ClientField2=null&ClientField3=null&ClientFieldFlag=0&ShopID=<SHOP_ID>&ShopPass=<SHOP_PASS>
     headers:
       Accept:
@@ -62,7 +62,7 @@ http_interactions:
     method: post
     uri: https://<HOST>/payment/ChangeTran.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: AccessID=53423389f2059b97ab86faa87ccf5ebc&AccessPass=7e0c971d8b63bd6924f88caec7dd056a&JobCd=AUTH&Amount=1000&ShopID=<SHOP_ID>&ShopPass=<SHOP_PASS>
     headers:
       Accept:
diff --git a/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_change_tran_got_error_if_missing_options.yml b/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_change_tran_got_error_if_missing_options.yml
index d817f4b..3e9ae8c 100644
--- a/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_change_tran_got_error_if_missing_options.yml
+++ b/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_change_tran_got_error_if_missing_options.yml
@@ -4,7 +4,7 @@ http_interactions:
     method: post
     uri: https://<HOST>/payment/SearchTradeMulti.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: OrderID=null&PayType=null&ShopID=<SHOP_ID>&ShopPass=<SHOP_PASS>
     headers:
       Accept:
diff --git a/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_cvs_cancel_gets_data_about_a_transaction.yml b/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_cvs_cancel_gets_data_about_a_transaction.yml
index 89d8321..670f1b3 100644
--- a/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_cvs_cancel_gets_data_about_a_transaction.yml
+++ b/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_cvs_cancel_gets_data_about_a_transaction.yml
@@ -4,7 +4,7 @@ http_interactions:
     method: post
     uri: https://<HOST>/payment/EntryTranCvs.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: OrderID=1362106772&Amount=100&ShopID=<SHOP_ID>&ShopPass=<SHOP_PASS>
     headers:
       Accept:
@@ -33,7 +33,7 @@ http_interactions:
     method: post
     uri: https://<HOST>/payment/CvsCancel.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: OrderID=1365660033&AccessID=3618be802c7ac572414274731e50cb6c&AccessPass=4099664bd4b110800e09805539d1d7b5&ShopID=<SHOP_ID>&ShopPass=<SHOP_PASS>
     headers:
       Accept-Encoding:
diff --git a/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_entry_tran_brandtoken_gets_data_about_a_transaction.yml b/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_entry_tran_brandtoken_gets_data_about_a_transaction.yml
index fb93629..c955cac 100644
--- a/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_entry_tran_brandtoken_gets_data_about_a_transaction.yml
+++ b/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_entry_tran_brandtoken_gets_data_about_a_transaction.yml
@@ -4,7 +4,7 @@ http_interactions:
     method: post
     uri: https://<HOST>/payment/EntryTranBrandtoken.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: OrderID=<SHOP_PASS>502<SHOP_PASS>77398&JobCd=AUTH&Amount=<SHOP_PASS>00&ShopID=<SHOP_ID>&ShopPass=<SHOP_PASS>
     headers:
       Accept-Encoding:
@@ -31,7 +31,7 @@ http_interactions:
       Content-Language:
       - ja-JP
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: AccessID=<SHOP_PASS>da06<SHOP_PASS>87345d6<SHOP_PASS>3ce206f4cd05bc5322&AccessPass=45a2<SHOP_PASS>e63323c3795d26e22338eaa6b7f
     http_version:
   recorded_at: Tue, 08 Aug 2017 07:29:59 GMT
diff --git a/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_entry_tran_cvs_gets_data_about_a_transaction.yml b/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_entry_tran_cvs_gets_data_about_a_transaction.yml
index 9c0f59e..a33ee1e 100644
--- a/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_entry_tran_cvs_gets_data_about_a_transaction.yml
+++ b/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_entry_tran_cvs_gets_data_about_a_transaction.yml
@@ -4,7 +4,7 @@ http_interactions:
     method: post
     uri: https://<HOST>/payment/EntryTranCvs.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: OrderID=1362106772&Amount=100&ShopID=<SHOP_ID>&ShopPass=<SHOP_PASS>
     headers:
       Accept:
diff --git a/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_entry_tran_cvs_got_error_if_missing_options.yml b/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_entry_tran_cvs_got_error_if_missing_options.yml
index ceaa952..ae46f15 100644
--- a/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_entry_tran_cvs_got_error_if_missing_options.yml
+++ b/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_entry_tran_cvs_got_error_if_missing_options.yml
@@ -4,7 +4,7 @@ http_interactions:
     method: post
     uri: https://<HOST>/payment/EntryTranCvs.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: OrderID=null&JobCd=null&Amount=null&ShopID=<SHOP_ID>&ShopPass=<SHOP_PASS>
     headers:
       Accept:
diff --git a/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_entry_tran_docomo_gets_data_about_a_transaction.yml b/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_entry_tran_docomo_gets_data_about_a_transaction.yml
index 27fb64d..3f0d7eb 100644
--- a/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_entry_tran_docomo_gets_data_about_a_transaction.yml
+++ b/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_entry_tran_docomo_gets_data_about_a_transaction.yml
@@ -4,7 +4,7 @@ http_interactions:
     method: post
     uri: https://<HOST>/payment/EntryTranDocomo.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: OrderID=<TOKEN>6092250<TOKEN>3&JobCd=AUTH&Amount=<TOKEN>00&ShopID=<SHOP_ID>&ShopPass=<SHOP_PASS>
     headers:
       Accept-Encoding:
@@ -29,7 +29,7 @@ http_interactions:
       Connection:
       - close
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: AccessID=bcda2c8fbc952<TOKEN>5dd37ad8f2a37<TOKEN>facf&AccessPass=fd3<TOKEN>337495ade97b96<TOKEN>2bb7cb9228b58
   recorded_at: Tue, 29 Dec 2020 06:56:54 GMT
 recorded_with: VCR 6.0.0
diff --git a/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_entry_tran_edy_gets_data_about_a_transaction.yml b/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_entry_tran_edy_gets_data_about_a_transaction.yml
index 25474b3..9d5097b 100644
--- a/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_entry_tran_edy_gets_data_about_a_transaction.yml
+++ b/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_entry_tran_edy_gets_data_about_a_transaction.yml
@@ -4,7 +4,7 @@ http_interactions:
     method: post
     uri: https://<HOST>/payment/EntryTranEdy.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: OrderID=<TOKEN>662969828&Amount=<TOKEN>00&ShopID=<SHOP_ID>&ShopPass=<SHOP_PASS>
     headers:
       Accept-Encoding:
@@ -29,7 +29,7 @@ http_interactions:
       Connection:
       - close
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: AccessID=63bff23f2cb9bfc9c528fd82f03<TOKEN>d04e&AccessPass=509ced83bb0acd48c958f3baff94452<TOKEN>
   recorded_at: Mon, 12 Sep 2022 08:03:49 GMT
 recorded_with: VCR 6.0.0
diff --git a/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_entry_tran_gets_data_about_a_transaction.yml b/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_entry_tran_gets_data_about_a_transaction.yml
index 654eadf..c1b8f69 100644
--- a/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_entry_tran_gets_data_about_a_transaction.yml
+++ b/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_entry_tran_gets_data_about_a_transaction.yml
@@ -4,7 +4,7 @@ http_interactions:
     method: post
     uri: https://<HOST>/payment/EntryTran.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: OrderID=1362106772&JobCd=AUTH&Amount=100&ShopID=<SHOP_ID>&ShopPass=<SHOP_PASS>
     headers:
       Accept:
diff --git a/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_entry_tran_got_error_if_missing_options.yml b/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_entry_tran_got_error_if_missing_options.yml
index b7e315a..e594e00 100644
--- a/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_entry_tran_got_error_if_missing_options.yml
+++ b/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_entry_tran_got_error_if_missing_options.yml
@@ -4,7 +4,7 @@ http_interactions:
     method: post
     uri: https://<HOST>/payment/EntryTran.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: OrderID=null&JobCd=null&Amount=null&ShopID=<SHOP_ID>&ShopPass=<SHOP_PASS>
     headers:
       Accept:
diff --git a/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_entry_tran_linepay_gets_data_about_a_transaction.yml b/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_entry_tran_linepay_gets_data_about_a_transaction.yml
index e883b31..564cf3d 100644
--- a/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_entry_tran_linepay_gets_data_about_a_transaction.yml
+++ b/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_entry_tran_linepay_gets_data_about_a_transaction.yml
@@ -4,7 +4,7 @@ http_interactions:
     method: post
     uri: https://<HOST>/payment/EntryTranLinepay.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: OrderID=1467366013&JobCd=CAPTURE&Amount=100&ShopID=<SHOP_ID>&ShopPass=<SHOP_PASS>
     headers:
       Accept-Encoding:
@@ -29,7 +29,7 @@ http_interactions:
       Connection:
       - close
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: OrderID=1467366013&AccessID=2eb607a4a86106c53f8748e59de5d41b&AccessPass=3fb30254d3e3e6b4efbfe6eedda7196d
     http_version: 
   recorded_at: Fri, 01 Jul 2016 09:40:14 GMT
diff --git a/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_entry_tran_pay_easy_gets_data_about_a_transaction.yml b/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_entry_tran_pay_easy_gets_data_about_a_transaction.yml
index efcd68c..0d65b66 100644
--- a/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_entry_tran_pay_easy_gets_data_about_a_transaction.yml
+++ b/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_entry_tran_pay_easy_gets_data_about_a_transaction.yml
@@ -4,7 +4,7 @@ http_interactions:
     method: post
     uri: https://<HOST>/payment/EntryTranPayEasy.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: OrderID=1448103619&Amount=100&ShopID=<SHOP_ID>&ShopPass=<SHOP_PASS>
     headers:
       Accept-Encoding:
@@ -29,7 +29,7 @@ http_interactions:
       Connection:
       - close
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: AccessID=282b61afb9cabee8e72d49db77c08e2f&AccessPass=9c4883358947a15683f8a63f5fc7aef4
     http_version: 
   recorded_at: Sat, 21 Nov 2015 11:00:19 GMT
diff --git a/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_entry_tran_rakuten_id_gets_data_about_a_transaction.yml b/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_entry_tran_rakuten_id_gets_data_about_a_transaction.yml
index 78a9e28..2186e6a 100644
--- a/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_entry_tran_rakuten_id_gets_data_about_a_transaction.yml
+++ b/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_entry_tran_rakuten_id_gets_data_about_a_transaction.yml
@@ -4,7 +4,7 @@ http_interactions:
     method: post
     uri: https://<HOST>/payment/EntryTranRakutenId.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: OrderID=<TOKEN>609222<TOKEN>40&JobCd=AUTH&Amount=<TOKEN>00&ShopID=<SHOP_ID>&ShopPass=<SHOP_PASS>
     headers:
       Accept-Encoding:
@@ -29,7 +29,7 @@ http_interactions:
       Connection:
       - close
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: OrderID=<TOKEN>609222<TOKEN>40&AccessID=8e9d8824c386409e247eb<TOKEN>badf34ff68&AccessPass=c963<TOKEN>bd080cebf5c0869feef<TOKEN>a638ddb
   recorded_at: Tue, 29 Dec 2020 06:09:00 GMT
 recorded_with: VCR 6.0.0
diff --git a/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_entry_tran_suica_gets_data_about_a_transaction.yml b/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_entry_tran_suica_gets_data_about_a_transaction.yml
index d8f73d0..4b05c11 100644
--- a/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_entry_tran_suica_gets_data_about_a_transaction.yml
+++ b/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_entry_tran_suica_gets_data_about_a_transaction.yml
@@ -4,7 +4,7 @@ http_interactions:
     method: post
     uri: https://<HOST>/payment/EntryTranSuica.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: OrderID=<TOKEN>662969828&Amount=<TOKEN>00&ShopID=<SHOP_ID>&ShopPass=<SHOP_PASS>
     headers:
       Accept-Encoding:
@@ -29,7 +29,7 @@ http_interactions:
       Connection:
       - close
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: AccessID=63bff23f2cb9bfc9c528fd82f03<TOKEN>d04e&AccessPass=4737074<TOKEN>2<TOKEN>9075004e2a4f74fbca48db
   recorded_at: Mon, 12 Sep 2022 08:03:48 GMT
 recorded_with: VCR 6.0.0
diff --git a/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_entry_tran_virtualaccount_gets_data_about_a_transaction.yml b/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_entry_tran_virtualaccount_gets_data_about_a_transaction.yml
index 06c82f8..0cee537 100644
--- a/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_entry_tran_virtualaccount_gets_data_about_a_transaction.yml
+++ b/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_entry_tran_virtualaccount_gets_data_about_a_transaction.yml
@@ -4,7 +4,7 @@ http_interactions:
     method: post
     uri: https://<HOST>/payment/EntryTranVirtualaccount.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: OrderID=<TOKEN>66262<TOKEN>284&Amount=<TOKEN>00&ShopID=<SHOP_ID>&ShopPass=<SHOP_PASS>
     headers:
       Accept-Encoding:
@@ -29,7 +29,7 @@ http_interactions:
       Connection:
       - close
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: OrderID=<TOKEN>66262<TOKEN>284&AccessID=672560ef8bfede4aece2bdd43a66dd59&AccessPass=b436e6b362b89c622<TOKEN>f266be<TOKEN>43<TOKEN>b290
   recorded_at: Thu, 08 Sep 2022 07:14:44 GMT
 recorded_with: VCR 6.0.0
diff --git a/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_exec_tran_brandtoken_gets_data_about_a_transaction.yml b/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_exec_tran_brandtoken_gets_data_about_a_transaction.yml
index 940f43e..a81bec7 100644
--- a/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_exec_tran_brandtoken_gets_data_about_a_transaction.yml
+++ b/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_exec_tran_brandtoken_gets_data_about_a_transaction.yml
@@ -4,7 +4,7 @@ http_interactions:
     method: post
     uri: https://<HOST>/payment/EntryTranBrandtoken.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: OrderID=<SHOP_PASS>502<SHOP_PASS>78834&JobCd=AUTH&Amount=<SHOP_PASS>00&ShopID=<SHOP_ID>&ShopPass=<SHOP_PASS>
     headers:
       Accept-Encoding:
@@ -31,7 +31,7 @@ http_interactions:
       Content-Language:
       - ja-JP
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: AccessID=<SHOP_PASS>da06<SHOP_PASS>87345d6<SHOP_PASS>3ce206f4cd05bc5322&AccessPass=45a2<SHOP_PASS>e63323c3795d26e22338eaa6b7f
     http_version:
   recorded_at: Tue, 08 Aug 2017 07:53:55 GMT
@@ -39,7 +39,7 @@ http_interactions:
     method: post
     uri: https://<HOST>/payment/ExecTranBrandtoken.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: OrderID=<SHOP_PASS>502<SHOP_PASS>78987&AccessID=<SHOP_PASS>da06<SHOP_PASS>87345d6<SHOP_PASS>3ce206f4cd05bc5322&AccessPass=45a2<SHOP_PASS>e63323c3795d26e22338eaa6b7f&TokenType=APay&Token=base64encodedtoken&ClientField<SHOP_PASS>=client_field<SHOP_PASS>&ShopID=<SHOP_ID>&ShopPass=<SHOP_PASS>
     headers:
       Accept-Encoding:
@@ -66,7 +66,7 @@ http_interactions:
       Content-Language:
       - ja-JP
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: Status=AUTH&OrderID=597ae8c36120b23a3c00014e&Forward=2a99663&Approve=5487394&TranID=1707281634111111111111771216&TranDate=20170728163453&ClientField1=client_field1&ClientField2=&ClientField3=
     http_version:
   recorded_at: Tue, 08 Aug 2017 07:56:28 GMT
diff --git a/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_exec_tran_brandtoken_parameter_contains_Japanese_characters_should_correctly_handle_Japanese.yml b/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_exec_tran_brandtoken_parameter_contains_Japanese_characters_should_correctly_handle_Japanese.yml
index 1dc1637..be8f0b4 100644
--- a/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_exec_tran_brandtoken_parameter_contains_Japanese_characters_should_correctly_handle_Japanese.yml
+++ b/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_exec_tran_brandtoken_parameter_contains_Japanese_characters_should_correctly_handle_Japanese.yml
@@ -4,7 +4,7 @@ http_interactions:
     method: post
     uri: https://<HOST>/payment/EntryTranBrandtoken.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: OrderID=<SHOP_PASS>502<SHOP_PASS>78988&JobCd=AUTH&Amount=<SHOP_PASS>00&ShopID=<SHOP_ID>&ShopPass=<SHOP_PASS>
     headers:
       Accept-Encoding:
@@ -31,7 +31,7 @@ http_interactions:
       Content-Language:
       - ja-JP
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: AccessID=<SHOP_PASS>da06<SHOP_PASS>87345d6<SHOP_PASS>3ce206f4cd05bc5322&AccessPass=45a2<SHOP_PASS>e63323c3795d26e22338eaa6b7f
     http_version:
   recorded_at: Tue, 08 Aug 2017 07:56:29 GMT
@@ -39,7 +39,7 @@ http_interactions:
     method: post
     uri: https://<HOST>/payment/ExecTranBrandtoken.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: OrderID=<SHOP_PASS>502<SHOP_PASS>78987&AccessID=<SHOP_PASS>da06<SHOP_PASS>87345d6<SHOP_PASS>3ce206f4cd05bc5322&AccessPass=45a2<SHOP_PASS>e63323c3795d26e22338eaa6b7f&TokenType=APay&Token=base64encodedtoken&ClientField<SHOP_PASS>=client_field<SHOP_PASS>&ShopID=<SHOP_ID>&ShopPass=<SHOP_PASS>
     headers:
       Accept-Encoding:
@@ -66,8 +66,8 @@ http_interactions:
       Content-Language:
       - ja-JP
     body:
-      encoding: UTF-8
-      string: Status=AUTH&OrderID=597ae8c36120b23a3c00014e&Forward=2a99663&Approve=5487394&TranID=1707281634111111111111771216&TranDate=20170728163453&ClientField1=〜−¢£¬−‖①ほげほげhogehoge&ClientField2=&ClientField3=
+      encoding: Windows-31J
+      string: Status=AUTH&OrderID=597ae8c36120b23a3c00014e&Forward=2a99663&Approve=5487394&TranID=1707281634111111111111771216&TranDate=20170728163453&ClientField1=ｶｿｳｼﾃﾝ&ClientField2=&ClientField3=
     http_version:
   recorded_at: Tue, 08 Aug 2017 07:56:28 GMT
 recorded_with: VCR 3.0.3
diff --git a/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_exec_tran_cvs_gets_data_about_a_transaction.yml b/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_exec_tran_cvs_gets_data_about_a_transaction.yml
index ea35130..6228918 100644
--- a/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_exec_tran_cvs_gets_data_about_a_transaction.yml
+++ b/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_exec_tran_cvs_gets_data_about_a_transaction.yml
@@ -4,7 +4,7 @@ http_interactions:
     method: post
     uri: https://<HOST>/payment/EntryTranCvs.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: OrderID=1362106772&Amount=100&ShopID=<SHOP_ID>&ShopPass=<SHOP_PASS>
     headers:
       Accept:
@@ -33,7 +33,7 @@ http_interactions:
     method: post
     uri: https://<HOST>/payment/ExecTranCvs.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: OrderID=1365660033&AccessID=3618be802c7ac572414274731e50cb6c&AccessPass=4099664bd4b110800e09805539d1d7b5&Convenience=00001&CustomerName=%E3%82%B3%E3%83%B3%E3%83%93%E3%83%8B%E5%A4%AA%E9%83%8E&CustomerKana=%E3%82%B3%E3%83%B3%E3%83%93%E3%83%8B%E3%82%BF%E3%83%AD%E3%82%A6&TelNo=0300000001&ReceiptsDisp11=RSpec+Helpdesk&ReceiptsDisp12=RSpec+hotline&ReceiptsDisp13=00%3A00-00%3A15&ClientField1=client_field1&ShopID=<SHOP_ID>&ShopPass=<SHOP_PASS>
     headers:
       Accept-Encoding:
diff --git a/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_exec_tran_docomo_gets_data_about_a_transaction.yml b/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_exec_tran_docomo_gets_data_about_a_transaction.yml
index 8b67532..c7e115c 100644
--- a/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_exec_tran_docomo_gets_data_about_a_transaction.yml
+++ b/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_exec_tran_docomo_gets_data_about_a_transaction.yml
@@ -4,7 +4,7 @@ http_interactions:
     method: post
     uri: https://<HOST>/payment/EntryTranDocomo.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: OrderID=<TOKEN>6092250<TOKEN>4&JobCd=CAPTURE&Amount=<TOKEN>00&ShopID=<SHOP_ID>&ShopPass=<SHOP_PASS>
     headers:
       Accept-Encoding:
@@ -29,14 +29,14 @@ http_interactions:
       Connection:
       - close
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: AccessID=980a<TOKEN>cf8<TOKEN>a58ea7<TOKEN>2828f82b5cab36b4&AccessPass=30e<TOKEN>87<TOKEN>76420ef72d743e<TOKEN>923f60c228
   recorded_at: Tue, 29 Dec 2020 06:56:54 GMT
 - request:
     method: post
     uri: https://<HOST>/payment/ExecTranDocomo.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: OrderID=<TOKEN>6092250<TOKEN>4&AccessID=980a<TOKEN>cf8<TOKEN>a58ea7<TOKEN>2828f82b5cab36b4&AccessPass=30e<TOKEN>87<TOKEN>76420ef72d743e<TOKEN>923f60c228&RetURL=https%3A%2F%2Fexample.com%2Fpath%2Fto%2Freturn%2Fsuccess&ErrorRcvURL=https%3A%2F%2Fexample.com%2Fpath%2Fto%2Freturn%2Ffailure&ItemId=000<TOKEN>&ItemName=%8Dw%93%FC%82%B7%82%E9%8F%A4%95i%96%BC&ShopID=<SHOP_ID>&ShopPass=<SHOP_PASS>
     headers:
       Accept-Encoding:
@@ -61,7 +61,7 @@ http_interactions:
       Connection:
       - close
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: AccessID=980a<TOKEN>cf8<TOKEN>a58ea7<TOKEN>2828f82b5cab36b4&Token=MUPNG5Kkc3cF3W2yFjT6DXACIf+qn<TOKEN>h7bqaBFFxarXKwBS7yYvxSiC0zeMVH+O4F&StartURL=https://<HOST>/payment/DocomoStart.idPass&StartLimitDate=2020<TOKEN>229<TOKEN>55854
   recorded_at: Tue, 29 Dec 2020 06:56:55 GMT
 recorded_with: VCR 6.0.0
diff --git a/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_exec_tran_doesn_t_require_card_info_if_token_is_present.yml b/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_exec_tran_doesn_t_require_card_info_if_token_is_present.yml
index efbcdfe..db94225 100644
--- a/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_exec_tran_doesn_t_require_card_info_if_token_is_present.yml
+++ b/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_exec_tran_doesn_t_require_card_info_if_token_is_present.yml
@@ -4,7 +4,7 @@ http_interactions:
     method: post
     uri: https://<HOST>/payment/EntryTran.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: OrderID=1516092147&JobCd=AUTH&Amount=100&ShopID=<SHOP_ID>&ShopPass=<SHOP_PASS>
     headers:
       Accept-Encoding:
@@ -29,7 +29,7 @@ http_interactions:
       Connection:
       - close
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: AccessID=fda0ae7f80d8f8855cb9f2229e22117a&AccessPass=a2a2b20bc81475e33573af93ece908cf
     http_version: 
   recorded_at: Tue, 16 Jan 2018 08:42:28 GMT
@@ -37,7 +37,7 @@ http_interactions:
     method: post
     uri: https://<HOST>/payment/ExecTran.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: OrderID=1516092147&AccessID=fda0ae7f80d8f8855cb9f2229e22117a&AccessPass=a2a2b20bc81475e33573af93ece908cf&Method=1&PayTimes=1&Token=onetimetokenfromgmo&ClientFieldFlag=0&DeviceCategory=0&ShopID=<SHOP_ID>&ShopPass=<SHOP_PASS>
     headers:
       Accept-Encoding:
@@ -62,7 +62,7 @@ http_interactions:
       Connection:
       - close
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: ErrCode=EX1&ErrInfo=EX1000301
     http_version: 
   recorded_at: Tue, 16 Jan 2018 08:42:28 GMT
diff --git a/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_exec_tran_edy_gets_data_about_a_transaction.yml b/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_exec_tran_edy_gets_data_about_a_transaction.yml
index 8797bcf..91e635d 100644
--- a/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_exec_tran_edy_gets_data_about_a_transaction.yml
+++ b/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_exec_tran_edy_gets_data_about_a_transaction.yml
@@ -4,7 +4,7 @@ http_interactions:
     method: post
     uri: https://<HOST>/payment/EntryTranEdy.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: OrderID=<TOKEN>662970040&Amount=<TOKEN>00&ShopID=<SHOP_ID>&ShopPass=<SHOP_PASS>
     headers:
       Accept-Encoding:
@@ -29,14 +29,14 @@ http_interactions:
       Connection:
       - close
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: AccessID=<TOKEN>e85e402df4ae23036f6de940c4eb2d7&AccessPass=<TOKEN>6440b8df892<TOKEN>f<TOKEN>0a2dba3<TOKEN>cb2<TOKEN>03805
   recorded_at: Mon, 12 Sep 2022 08:07:20 GMT
 - request:
     method: post
     uri: https://<HOST>/payment/ExecTranEdy.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: OrderID=<TOKEN>662970040&AccessID=<TOKEN>e85e402df4ae23036f6de940c4eb2d7&AccessPass=<TOKEN>6440b8df892<TOKEN>f<TOKEN>0a2dba3<TOKEN>cb2<TOKEN>03805&MailAddress=test%40example.com&ClientField<TOKEN>=client_field<TOKEN>&ClientFieldFlag=<TOKEN>&ShopID=<SHOP_ID>&ShopPass=<SHOP_PASS>
     headers:
       Accept-Encoding:
@@ -61,7 +61,7 @@ http_interactions:
       Connection:
       - close
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: OrderID=<TOKEN>662970040&ReceiptNo=EDY<TOKEN>662970042705&EdyOrderNo=<TOKEN>662970040-2209<TOKEN>204852<TOKEN>&PaymentTerm=20220922<TOKEN>70722&TranDate=202209<TOKEN>2<TOKEN>70722&CheckString=8db002858a8d3b8<TOKEN>eaf4b3<TOKEN>e7a2c<TOKEN>d20&ClientField<TOKEN>=client_field<TOKEN>&ClientField2=&ClientField3=
   recorded_at: Mon, 12 Sep 2022 08:07:23 GMT
 recorded_with: VCR 6.0.0
diff --git a/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_exec_tran_gets_data_about_a_transaction.yml b/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_exec_tran_gets_data_about_a_transaction.yml
index 0946026..fe43313 100644
--- a/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_exec_tran_gets_data_about_a_transaction.yml
+++ b/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_exec_tran_gets_data_about_a_transaction.yml
@@ -4,7 +4,7 @@ http_interactions:
     method: post
     uri: https://<HOST>/payment/EntryTran.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: OrderID=1362106991&JobCd=AUTH&Amount=100&ShopID=<SHOP_ID>&ShopPass=<SHOP_PASS>
     headers:
       Accept:
@@ -33,7 +33,7 @@ http_interactions:
     method: post
     uri: https://<HOST>/payment/ExecTran.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: AccessID=e65385d62b5e5e9be64d2c8cecdb24f2&AccessPass=a79882df473a228fd2a00051e72642be&OrderID=1362106991&Method=1&PayTimes=1&CardNo=4111111111111111&Expire=1405&HttpAccept=null&HttpUserAgent=null&DeviceCategory=0&ClientField1=client_field1&ClientField2=null&ClientField3=null&ClientFieldFlag=1&ShopID=<SHOP_ID>&ShopPass=<SHOP_PASS>
     headers:
       Accept:
diff --git a/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_exec_tran_got_error_if_missing_options.yml b/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_exec_tran_got_error_if_missing_options.yml
index a4e757b..cc5f562 100644
--- a/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_exec_tran_got_error_if_missing_options.yml
+++ b/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_exec_tran_got_error_if_missing_options.yml
@@ -4,7 +4,7 @@ http_interactions:
     method: post
     uri: https://<HOST>/payment/ExecTran.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: AccessID=null&AccessPass=null&OrderID=null&Method=null&PayTimes=null&CardNo=null&Expire=null&HttpAccept=null&HttpUserAgent=null&DeviceCategory=0&ClientField1=null&ClientField2=null&ClientField3=null&ClientFieldFlag=0&ShopID=<SHOP_ID>&ShopPass=<SHOP_PASS>
     headers:
       Accept:
diff --git a/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_exec_tran_linepay_gets_data_about_a_transaction.yml b/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_exec_tran_linepay_gets_data_about_a_transaction.yml
index a27c3b2..be69f94 100644
--- a/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_exec_tran_linepay_gets_data_about_a_transaction.yml
+++ b/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_exec_tran_linepay_gets_data_about_a_transaction.yml
@@ -4,7 +4,7 @@ http_interactions:
     method: post
     uri: https://<HOST>/payment/EntryTranLinepay.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: OrderID=1467366014&JobCd=CAPTURE&Amount=100&ShopID=<SHOP_ID>&ShopPass=<SHOP_PASS>
     headers:
       Accept-Encoding:
@@ -29,7 +29,7 @@ http_interactions:
       Connection:
       - close
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: OrderID=1467366014&AccessID=2352c8be3fd34b2e75ce3fd2b19c1cd2&AccessPass=06561ea4bbb6200b172a58457c88776f
     http_version: 
   recorded_at: Fri, 01 Jul 2016 09:40:14 GMT
@@ -37,7 +37,7 @@ http_interactions:
     method: post
     uri: https://<HOST>/payment/ExecTranLinepay.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: OrderID=1467366014&AccessID=2352c8be3fd34b2e75ce3fd2b19c1cd2&AccessPass=06561ea4bbb6200b172a58457c88776f&RetURL=https%3A%2F%2Fexample.com%2Fpath%2Fto%2Freturn%2Fsuccess&ErrorRcvURL=https%3A%2F%2Fexample.com%2Fpath%2Fto%2Freturn%2Ffailure&ProductName=%8Dw%93%FC%82%B7%82%E9%8F%A4%95i%96%BC&ShopID=<SHOP_ID>&ShopPass=<SHOP_PASS>
     headers:
       Accept-Encoding:
@@ -62,7 +62,7 @@ http_interactions:
       Connection:
       - close
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: Start=1&AccessID=2352c8be3fd34b2e75ce3fd2b19c1cd2&Token=5eUT14IYmsZRnCs/S/RYxKrphuf29PTylubWI8BbbUuwBS7yYvxSiC0zeMVH+O4F&StartURL=https://<HOST>/payment/LinepayStart.idPass
     http_version: 
   recorded_at: Fri, 01 Jul 2016 09:40:14 GMT
diff --git a/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_exec_tran_parameter_contains_Japanese_characters_should_correctly_handle_Japanese.yml b/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_exec_tran_parameter_contains_Japanese_characters_should_correctly_handle_Japanese.yml
index 9b778e6..80daeeb 100644
--- a/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_exec_tran_parameter_contains_Japanese_characters_should_correctly_handle_Japanese.yml
+++ b/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_exec_tran_parameter_contains_Japanese_characters_should_correctly_handle_Japanese.yml
@@ -4,7 +4,7 @@ http_interactions:
     method: post
     uri: https://<HOST>/payment/EntryTran.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: OrderID=1366160239&JobCd=AUTH&Amount=100&ShopID=<SHOP_ID>&ShopPass=<SHOP_PASS>
     headers:
       Accept-Encoding:
@@ -27,7 +27,7 @@ http_interactions:
       Transfer-Encoding:
       - chunked
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: AccessID=68334b323b78058c0ecbbaa996b80ca1&AccessPass=8499e4c83fbd277577f6ce2d95e86868
     http_version: 
   recorded_at: Wed, 17 Apr 2013 00:57:19 GMT
@@ -35,7 +35,7 @@ http_interactions:
     method: post
     uri: https://<HOST>/payment/ExecTran.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: OrderID=1366160239&AccessID=68334b323b78058c0ecbbaa996b80ca1&AccessPass=8499e4c83fbd277577f6ce2d95e86868&Method=1&PayTimes=1&CardNo=4111111111111111&Expire=1405&ClientField1=%81%60%81%7C%81%91%81%92%81%CA%81%7C%81a%87%40%82%D9%82%B0%82%D9%82%B0hogehoge&ClientFieldFlag=1&DeviceCategory=0&ShopID=<SHOP_ID>&ShopPass=<SHOP_PASS>
     headers:
       Accept-Encoding:
diff --git a/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_exec_tran_pay_easy_gets_data_about_a_transaction.yml b/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_exec_tran_pay_easy_gets_data_about_a_transaction.yml
index 126fa70..1206105 100644
--- a/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_exec_tran_pay_easy_gets_data_about_a_transaction.yml
+++ b/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_exec_tran_pay_easy_gets_data_about_a_transaction.yml
@@ -4,7 +4,7 @@ http_interactions:
     method: post
     uri: https://<HOST>/payment/EntryTranPayEasy.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: OrderID=1448105474&Amount=100&ShopID=<SHOP_ID>&ShopPass=<SHOP_PASS>
     headers:
       Accept-Encoding:
@@ -29,7 +29,7 @@ http_interactions:
       Connection:
       - close
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: AccessID=eb18bcc94bd6027929b2cb401b5eff9b&AccessPass=e79f0cbfb6b00343beb85eb8df873277
     http_version: 
   recorded_at: Sat, 21 Nov 2015 11:31:15 GMT
@@ -37,7 +37,7 @@ http_interactions:
     method: post
     uri: https://<HOST>/payment/ExecTranPayEasy.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: OrderID=1448105474&AccessID=eb18bcc94bd6027929b2cb401b5eff9b&AccessPass=e79f0cbfb6b00343beb85eb8df873277&CustomerName=%83y%83C%91%BE%98Y&CustomerKana=%83y%83C%83%5E%83%8D%83E&TelNo=0300000001&ReceiptsDisp11=RSpec+Helpdesk&ReceiptsDisp12=0300000001&ReceiptsDisp13=00%3A00-00%3A15&ShopID=<SHOP_ID>&ShopPass=<SHOP_PASS>
     headers:
       Accept-Encoding:
@@ -62,7 +62,7 @@ http_interactions:
       Connection:
       - close
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: OrderID=1448105474&CustID=WNT05476383&BkCode=58021&ConfNo=3769&EncryptReceiptNo=LB7OigJvPDmbWxAqB8OY&PaymentTerm=20151201235959&TranDate=20151121203100&CheckString=6a7c5cb87d1857e9b9088d65480545e3
     http_version: 
   recorded_at: Sat, 21 Nov 2015 11:31:16 GMT
diff --git a/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_exec_tran_rakuten_id_gets_data_about_a_transaction.yml b/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_exec_tran_rakuten_id_gets_data_about_a_transaction.yml
index 97680e3..f06a847 100644
--- a/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_exec_tran_rakuten_id_gets_data_about_a_transaction.yml
+++ b/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_exec_tran_rakuten_id_gets_data_about_a_transaction.yml
@@ -4,7 +4,7 @@ http_interactions:
     method: post
     uri: https://<HOST>/payment/EntryTranRakutenId.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: OrderID=<TOKEN>609222947&JobCd=CAPTURE&Amount=<TOKEN>00&ShopID=<SHOP_ID>&ShopPass=<SHOP_PASS>
     headers:
       Accept-Encoding:
@@ -29,14 +29,14 @@ http_interactions:
       Connection:
       - close
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: OrderID=<TOKEN>609222947&AccessID=a890<TOKEN><TOKEN><TOKEN>530f250c<TOKEN>3e3c884ae273060a&AccessPass=55fff26783<TOKEN>070a<TOKEN>040edd36f73b26ec
   recorded_at: Tue, 29 Dec 2020 06:22:28 GMT
 - request:
     method: post
     uri: https://<HOST>/payment/ExecTranRakutenId.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: OrderID=<TOKEN>609222947&AccessID=a890<TOKEN><TOKEN><TOKEN>530f250c<TOKEN>3e3c884ae273060a&AccessPass=55fff26783<TOKEN>070a<TOKEN>040edd36f73b26ec&RetURL=https%3A%2F%2Fexample.com%2Fpath%2Fto%2Freturn%2Fsuccess&ErrorRcvURL=https%3A%2F%2Fexample.com%2Fpath%2Fto%2Freturn%2Ffailure&ItemId=000<TOKEN>&ItemName=%8Dw%93%FC%82%B7%82%E9%8F%A4%95i%96%BC&ShopID=<SHOP_ID>&ShopPass=<SHOP_PASS>
     headers:
       Accept-Encoding:
@@ -61,7 +61,7 @@ http_interactions:
       Connection:
       - close
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: AccessID=a890<TOKEN><TOKEN><TOKEN>530f250c<TOKEN>3e3c884ae273060a&Token=givwPbv44WyJuP66kQHXNHJ99gPQ6Yh/I5NrE0wMHxWwBS7yYvxSiC0zeMVH+O4F&StartURL=https://<HOST>/payment/RakutenIdStart.idPass&StartLimitDate=2020<TOKEN>229<TOKEN>52428
   recorded_at: Tue, 29 Dec 2020 06:22:28 GMT
 recorded_with: VCR 6.0.0
diff --git a/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_exec_tran_suica_gets_data_about_a_transaction.yml b/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_exec_tran_suica_gets_data_about_a_transaction.yml
index f60531c..4967b95 100644
--- a/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_exec_tran_suica_gets_data_about_a_transaction.yml
+++ b/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_exec_tran_suica_gets_data_about_a_transaction.yml
@@ -4,7 +4,7 @@ http_interactions:
     method: post
     uri: https://<HOST>/payment/EntryTranSuica.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: OrderID=<TOKEN>662969936&Amount=<TOKEN>00&ShopID=<SHOP_ID>&ShopPass=<SHOP_PASS>
     headers:
       Accept-Encoding:
@@ -29,14 +29,14 @@ http_interactions:
       Connection:
       - close
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: AccessID=288a3a<TOKEN>5032a<TOKEN>25e723dad49<TOKEN>5d3b28a&AccessPass=d2dea7b2b94eab5ab3bddcfbd9cf58bc
   recorded_at: Mon, 12 Sep 2022 08:05:37 GMT
 - request:
     method: post
     uri: https://<HOST>/payment/ExecTranSuica.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: OrderID=<TOKEN>662969936&AccessID=288a3a<TOKEN>5032a<TOKEN>25e723dad49<TOKEN>5d3b28a&AccessPass=d2dea7b2b94eab5ab3bddcfbd9cf58bc&ItemName=%8Dw%93%FC%82%B7%82%E9%8F%A4%95i%96%BC&MailAddress=test%40example.com&ClientField<TOKEN>=client_field<TOKEN>&ClientFieldFlag=<TOKEN>&ShopID=<SHOP_ID>&ShopPass=<SHOP_PASS>
     headers:
       Accept-Encoding:
@@ -61,7 +61,7 @@ http_interactions:
       Connection:
       - close
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: OrderID=<TOKEN>662969936&SuicaOrderNo=<TOKEN>662969936-2209<TOKEN>2052836&ReceiptNo=SCA93925<TOKEN>&PaymentTerm=20220922<TOKEN>70637&TranDate=202209<TOKEN>2<TOKEN>70539&CheckString=d<TOKEN>fca947cffe2aa892<TOKEN>7f3fcbb403d02&ClientField<TOKEN>=client_field<TOKEN>&ClientField2=&ClientField3=
   recorded_at: Mon, 12 Sep 2022 08:05:39 GMT
 recorded_with: VCR 6.0.0
diff --git a/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_exec_tran_virtualaccount_gets_data_about_a_transaction.yml b/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_exec_tran_virtualaccount_gets_data_about_a_transaction.yml
index 35b1a41..b5032c4 100644
--- a/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_exec_tran_virtualaccount_gets_data_about_a_transaction.yml
+++ b/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_exec_tran_virtualaccount_gets_data_about_a_transaction.yml
@@ -4,7 +4,7 @@ http_interactions:
     method: post
     uri: https://<HOST>/payment/EntryTranVirtualaccount.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: OrderID=<TOKEN>66262<TOKEN>552&Amount=<TOKEN>00&ShopID=<SHOP_ID>&ShopPass=<SHOP_PASS>
     headers:
       Accept-Encoding:
@@ -29,14 +29,14 @@ http_interactions:
       Connection:
       - close
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: OrderID=<TOKEN>66262<TOKEN>552&AccessID=dda76d2bb678f82<TOKEN>ad3e4a7ded59d5b0&AccessPass=fdeccc446bb3320f48259062055ad926
   recorded_at: Thu, 08 Sep 2022 07:19:13 GMT
 - request:
     method: post
     uri: https://<HOST>/payment/ExecTranVirtualaccount.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: OrderID=<TOKEN>66262<TOKEN>552&AccessID=dda76d2bb678f82<TOKEN>ad3e4a7ded59d5b0&AccessPass=fdeccc446bb3320f48259062055ad926&TradeDays=<TOKEN>4&ShopID=<SHOP_ID>&ShopPass=<SHOP_PASS>
     headers:
       Accept-Encoding:
diff --git a/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_refund_tran_brandtoken_gets_data_about_a_transaction.yml b/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_refund_tran_brandtoken_gets_data_about_a_transaction.yml
index d1a5b50..ad9dbc3 100644
--- a/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_refund_tran_brandtoken_gets_data_about_a_transaction.yml
+++ b/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_refund_tran_brandtoken_gets_data_about_a_transaction.yml
@@ -4,7 +4,7 @@ http_interactions:
     method: post
     uri: https://<HOST>/payment/EntryTranBrandtoken.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: OrderID=<SHOP_PASS>502<SHOP_PASS>90462&JobCd=CAPTURE&Amount=<SHOP_PASS>000&ShopID=<SHOP_ID>&ShopPass=<SHOP_PASS>
     headers:
       Accept-Encoding:
@@ -31,7 +31,7 @@ http_interactions:
       Content-Language:
       - ja-JP
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: AccessID=<SHOP_PASS>da06<SHOP_PASS>87345d6<SHOP_PASS>3ce206f4cd05bc5322&AccessPass=45a2<SHOP_PASS>e63323c3795d26e22338eaa6b7f
     http_version:
   recorded_at: Tue, 08 Aug 2017 11:07:43 GMT
@@ -39,7 +39,7 @@ http_interactions:
     method: post
     uri: https://<HOST>/payment/ExecTranBrandtoken.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: OrderID=<SHOP_PASS>502<SHOP_PASS>78987&AccessID=<SHOP_PASS>da06<SHOP_PASS>87345d6<SHOP_PASS>3ce206f4cd05bc5322&AccessPass=45a2<SHOP_PASS>e63323c3795d26e22338eaa6b7f&TokenType=APay&Token=base64encodedtoken&ShopID=<SHOP_ID>&ShopPass=<SHOP_PASS>
     headers:
       Accept-Encoding:
@@ -66,7 +66,7 @@ http_interactions:
       Content-Language:
       - ja-JP
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: Status=CAPTURE&OrderID=597ae8c36<SHOP_PASS>20b23a3c000<SHOP_PASS>4e&Forward=2a99663&Approve=5487394&TranID=<SHOP_PASS>70728<SHOP_PASS>634<SHOP_PASS><SHOP_PASS><SHOP_PASS><SHOP_PASS><SHOP_PASS><SHOP_PASS><SHOP_PASS><SHOP_PASS><SHOP_PASS><SHOP_PASS><SHOP_PASS><SHOP_PASS>77<SHOP_PASS>2<SHOP_PASS>6&TranDate=20<SHOP_PASS>70728<SHOP_PASS>63453&ClientField<SHOP_PASS>=&ClientField2=&ClientField3=
     http_version:
   recorded_at: Tue, 08 Aug 2017 07:56:28 GMT
@@ -74,7 +74,7 @@ http_interactions:
     method: post
     uri: https://<HOST>/payment/RefundTranBrandtoken.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: AccessID=<SHOP_PASS>da06<SHOP_PASS>87345d6<SHOP_PASS>3ce206f4cd05bc5322&AccessPass=45a2<SHOP_PASS>e63323c3795d26e22338eaa6b7f&OrderID=<SHOP_PASS>502<SHOP_PASS>9055<SHOP_PASS>&Amount=<SHOP_PASS>000&ShopID=<SHOP_ID>&ShopPass=<SHOP_PASS>
     headers:
       Accept-Encoding:
@@ -101,7 +101,7 @@ http_interactions:
       Content-Language:
       - ja-JP
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: AccessID=139f8ec33a07c55f406937c52ce4473d&AccessPass=2689b204d2c17192fa35f9269fa7e744&Status=RETURN&Forward=2a99663&Approve=5537883&TranID=1707311620111111111111771220&TranDate=20170731162256
     http_version:
   recorded_at: Tue, 08 Aug 2017 11:09:12 GMT
diff --git a/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_sales_tran_brandtoken_gets_data_about_a_transaction.yml b/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_sales_tran_brandtoken_gets_data_about_a_transaction.yml
index 18dd5b9..01a4de6 100644
--- a/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_sales_tran_brandtoken_gets_data_about_a_transaction.yml
+++ b/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_sales_tran_brandtoken_gets_data_about_a_transaction.yml
@@ -4,7 +4,7 @@ http_interactions:
     method: post
     uri: https://<HOST>/payment/EntryTranBrandtoken.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: OrderID=<SHOP_PASS>502<SHOP_PASS>89826&JobCd=AUTH&Amount=<SHOP_PASS>000&ShopID=<SHOP_ID>&ShopPass=<SHOP_PASS>
     headers:
       Accept-Encoding:
@@ -31,7 +31,7 @@ http_interactions:
       Content-Language:
       - ja-JP
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: AccessID=<SHOP_PASS>da06<SHOP_PASS>87345d6<SHOP_PASS>3ce206f4cd05bc5322&AccessPass=45a2<SHOP_PASS>e63323c3795d26e22338eaa6b7f
     http_version:
   recorded_at: Tue, 08 Aug 2017 10:57:07 GMT
@@ -39,7 +39,7 @@ http_interactions:
     method: post
     uri: https://<HOST>/payment/ExecTranBrandtoken.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: OrderID=<SHOP_PASS>502<SHOP_PASS>78987&AccessID=<SHOP_PASS>da06<SHOP_PASS>87345d6<SHOP_PASS>3ce206f4cd05bc5322&AccessPass=45a2<SHOP_PASS>e63323c3795d26e22338eaa6b7f&TokenType=APay&Token=base64encodedtoken&ShopID=<SHOP_ID>&ShopPass=<SHOP_PASS>
     headers:
       Accept-Encoding:
@@ -66,7 +66,7 @@ http_interactions:
       Content-Language:
       - ja-JP
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: Status=AUTH&OrderID=597ae8c36<SHOP_PASS>20b23a3c000<SHOP_PASS>4e&Forward=2a99663&Approve=5487394&TranID=<SHOP_PASS>70728<SHOP_PASS>634<SHOP_PASS><SHOP_PASS><SHOP_PASS><SHOP_PASS><SHOP_PASS><SHOP_PASS><SHOP_PASS><SHOP_PASS><SHOP_PASS><SHOP_PASS><SHOP_PASS><SHOP_PASS>77<SHOP_PASS>2<SHOP_PASS>6&TranDate=20<SHOP_PASS>70728<SHOP_PASS>63453&ClientField<SHOP_PASS>=client_field<SHOP_PASS>&ClientField2=&ClientField3=
     http_version:
   recorded_at: Tue, 08 Aug 2017 07:56:28 GMT
@@ -74,7 +74,7 @@ http_interactions:
     method: post
     uri: https://<HOST>/payment/TradedBrandtoken.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: MemberID=<SHOP_PASS>502<SHOP_PASS>89924&OrderID=<SHOP_PASS>502<SHOP_PASS>89924&ShopID=<SHOP_ID>&ShopPass=<SHOP_PASS>&SiteID=<SITE_ID>&SitePass=<SHOP_PASS>
     headers:
       Accept-Encoding:
@@ -101,7 +101,7 @@ http_interactions:
       Content-Language:
       - ja-JP
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: TokenSeq=0&CardNoToken=*************<SHOP_PASS><SHOP_PASS><SHOP_PASS>&Forward=2a99663
     http_version:
   recorded_at: Tue, 08 Aug 2017 10:58:45 GMT
@@ -109,7 +109,7 @@ http_interactions:
     method: post
     uri: https://<HOST>/payment/SalesTranBrandtoken.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: AccessID=<SHOP_PASS>da06<SHOP_PASS>87345d6<SHOP_PASS>3ce206f4cd05bc5322&AccessPass=45a2<SHOP_PASS>e63323c3795d26e22338eaa6b7f&OrderID=<SHOP_PASS>502<SHOP_PASS>89957&Amount=<SHOP_PASS>000&ShopID=<SHOP_ID>&ShopPass=<SHOP_PASS>
     headers:
       Accept-Encoding:
@@ -136,7 +136,7 @@ http_interactions:
       Content-Language:
       - ja-JP
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: AccessID=139f8ec33a07c55f406937c52ce4473d&AccessPass=2689b204d2c17192fa35f9269fa7e744&Status=SALES&Forward=2a99663&Approve=5537883&TranID=1707311620111111111111771220&TranDate=20170731162256
     http_version:
   recorded_at: Tue, 08 Aug 2017 10:59:18 GMT
diff --git a/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_search_trade_gets_data_about_order.yml b/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_search_trade_gets_data_about_order.yml
index 6056477..b7b4c3b 100644
--- a/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_search_trade_gets_data_about_order.yml
+++ b/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_search_trade_gets_data_about_order.yml
@@ -4,7 +4,7 @@ http_interactions:
     method: post
     uri: https://<HOST>/payment/SearchTrade.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: OrderID=1362106772&ShopID=<SHOP_ID>&ShopPass=<SHOP_PASS>
     headers:
       Accept:
diff --git a/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_search_trade_got_error_if_missing_options.yml b/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_search_trade_got_error_if_missing_options.yml
index 01e9583..ca1cff6 100644
--- a/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_search_trade_got_error_if_missing_options.yml
+++ b/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_search_trade_got_error_if_missing_options.yml
@@ -4,7 +4,7 @@ http_interactions:
     method: post
     uri: https://<HOST>/payment/SearchTradeMulti.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: OrderID=null&PayType=null&ShopID=<SHOP_ID>&ShopPass=<SHOP_PASS>
     headers:
       Accept:
diff --git a/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_search_trade_multi_gets_data_about_order.yml b/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_search_trade_multi_gets_data_about_order.yml
index 018b495..f4024ff 100644
--- a/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_search_trade_multi_gets_data_about_order.yml
+++ b/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_search_trade_multi_gets_data_about_order.yml
@@ -4,7 +4,7 @@ http_interactions:
     method: post
     uri: https://<HOST>/payment/SearchTradeMulti.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: OrderID=1362106772&PayType=0&ShopID=<SHOP_ID>&ShopPass=<SHOP_PASS>
     headers:
       Accept:
diff --git a/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_search_trade_multi_got_error_if_missing_options.yml b/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_search_trade_multi_got_error_if_missing_options.yml
index 01e9583..ca1cff6 100644
--- a/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_search_trade_multi_got_error_if_missing_options.yml
+++ b/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_search_trade_multi_got_error_if_missing_options.yml
@@ -4,7 +4,7 @@ http_interactions:
     method: post
     uri: https://<HOST>/payment/SearchTradeMulti.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: OrderID=null&PayType=null&ShopID=<SHOP_ID>&ShopPass=<SHOP_PASS>
     headers:
       Accept:
diff --git a/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_secure_tran_gets_data_about_a_transaction.yml b/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_secure_tran_gets_data_about_a_transaction.yml
index 5b8592e..63b3f2b 100644
--- a/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_secure_tran_gets_data_about_a_transaction.yml
+++ b/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_secure_tran_gets_data_about_a_transaction.yml
@@ -4,7 +4,7 @@ http_interactions:
     method: post
     uri: https://<HOST>/payment/SecureTran.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: PaRes=eJydVluTokoSfvdXdPR5NGa4ycUJ2o0CSgRBuQu%2BIXfkooKA%2FvqFdk5Px4mN2I0lAq36yPwyKzMr%0D%0Aq9h%2FDWXx<SITE_PASS>kW3Jqurj3fsJ%2Fr%2BFlVBHWZV8vFuW%2BsfzPtb0%2FpV6Bd<SITE_PASS>FX28V%2FX7v<SITE_PASS>asld6iSDCj4H6L%0D%0AVqwaNY2fRG9Z%2BPGu%2BUZ0xShsQVIYTTI0weA0wzAoSdMoNf6iFM0s3lesBoyo%2BdRwyYPMHBQnFnlz%0D%0Aj4cLu3RREcA<SITE_PASS>AAAdBX%2F7thpd%2B4mzyN%2FT0egtSP2qXbF%2BcOWk3WqB4cSCZJHfU7aMbpKw%2BgRHm0v0%0D%0A9%2BcXzCJ%2F9LX7NGrGhQxZuFJz8FAt8FQFOKiC9FAF0E%2FvXpA%2BWGSSYEO%2FjVY4imMogWJvKPYLx38R%0D%0ADIt84uxlogNlfR%2B5MRRFWeQ7wo4hu40RfqyI5bicrxkbDZcxwKPEqPA<SITE_PASS>ZpE%2Fzl38aoV%2BewgCGwkm%0D%0AlLXcFdtm5TenMPQXTvzCR6c%2BcXZMYXtvVh6L%2FB6xgd9<SITE_PASS>KzA9uiRwAPKg<SITE_PASS>zmQqBC8nnGxnyJsFGQr%0D%0AdAzc9P%2BpBYqkvmVtWq7wl8wfgEUmV5DP5K5YM0uq0dgtehuLrGo%2B3tO2vfxCkL7vf%2FbEz%2FqWIPi4%0D%0AEARdIqNA2GTJX%2B8vrSiUqrhesbxf<SITE_PASS>VUW%2BEX29Nsx7WrUpnX49mXwP<SITE_PASS>FaxsSKIQbkf4y0PwJsUf2Y%0D%0AEJTAyHfkm<SITE_PASS>v%2FC9s%2FHbw<SITE_PASS>%2Fo8m9bGJyIjiaMpe9GYb0sf7X%2F%2BlkoUsiZr2%2FzH6t8EXg%2BMX92gV<SITE_PASS>vt<SITE_PASS>%0D%0AbJR7a7CCsjTIKAt3BV2ioliPqfsuySJfjo7j7%2BH9isRLEBxvC54KsbVxKAVX2gWDV<SITE_PASS>mba77B0ZPg%0D%0AqFAX5%2FhDPKdVRtfH86at5YV69KHY63NDCzAa673F<SITE_PASS>Ts3CiWFM<SITE_PASS>enusCYP5tgoF3Lg5nq%2BszybHFV%0D%0ABrwnHXOp5KbLBdiJaljrdHz<SITE_PASS>Bq<SITE_PASS>yruRaLYglIx2fRoP0xdoOrsCedeg<SITE_PASS>r<SITE_PASS>2CUjSmx8CNeuJ2w5EC%0D%0ANIohS4pFLJipHevbaLeGyj6qQUIldiGGFKz2Z4pcYvO<SITE_PASS>Ux%2FalnaCDJ8<SITE_PASS>pLl5SMA%2BBdcAwc5LPb87%0D%0A%2B8a4hHaiXJAMie56TcdzQPrlve2XEk%2B2fR%2Fuj552ID2676C6weRdDheXqzF74KZgpzmtOO6<SITE_PASS>vqdt%0D%0A4cfS<SITE_PASS>VyjG%2B2MU<SITE_PASS>7R<SITE_PASS>rAt8%2BTj4xX4b8Fmt9HjlQWXRJeC3%2FqvER%2Fd2iwea37sJaokQUXgeTCYCeil%0D%0AcXtKMpBP3XETgtIxfBWgY6ldRVM6EYIOOU63gSqJqao3Pa97gqPrIuzlrS<SITE_PASS>AfaaChQgwe9roGxtf%0D%0AX0Jx3XoW<SITE_PASS>CaSCef6XnTw9cM7yBfVTHo5%2BSTYCtxSM9FzYhyGwiOMh39Qk5l5IM%2Bhu0OD6pzoOHNX%0D%0AeE4NRf2uGmoPX5YVAVw4y%2BSs0OX6EyGjY<SITE_PASS>ftlRepIPDhJ6np7p6z8OA8JHF9P%2FIc9F<SITE_PASS>5stJNxDbh%0D%0AZKPi2T%2BQaSjaiY7CfpMGO9WC%2FW5qzdb0QvQwYfmEQXL2BeY8lz2hooLza3mpypsFGKAA9lyyc8Zg%0D%0AWhy2S33XSE8HOAhPsHvhgcUVYRqU62zmW7BWee8Vt<SITE_PASS>SNLbSVJeg0x8O49LLIJVjcjxvnGW5kUoK7%0D%0ATsn6xNoYZyWHjsqpL7<SITE_PASS>BVXUbW8%2BM77Ewkn79OxawfwXYEUcinpMDYocdXalPknHT%2FCPDYMwwWEjc%0D%0ATOjBJLAF9VgWOi8xkoWUqWHqx6VCUm0aZ8OBEp%2FIkVERZB6CqLaZtVIk6iZ3BaInGzfPuOBi%2BYSh%0D%0AztC%2B2z0CeHHS<SITE_PASS>rvn8HRalvpiTcowJ84mkhL<SITE_PASS>Qul3Eq4xQhogvfbkm%2F65vKZb0PRoHd2Vgy%2BmQh7g%0D%0A26zjZjVmh0N6<SITE_PASS>JX<SITE_PASS>Vbg7KS4kFrQ8Ms3ng3Q55LVImDJUrch2%2BUfHhGIU7ONzYB%2B7tqREQ9sIglQZ%0D%0AMddQZ0eebeW50gjpNQ9OttbFKbL2RGxP5%2FRTbIQlXUeZysf93lJbK7jECDmQTNPGSh<SITE_PASS>eq6K2Ze<SITE_PASS>U%0D%0Aomod%2BIl0YuYzjSzJXRccGCVlsEPFDWpzgno%2BOFyeyARmdY0gbrJ2C%2FZNQxnB7aZcb%2BOJyAEg5tGT%0D%0AI3%2BXUgh7nR%2B30<SITE_PASS>jNwJM96SgB77TQE7jjOOawsZf98UBaNtonBu7cj648Fq9zHsujCCrjchzLxnON%0D%0AQuU%2Bt<SITE_PASS>0oJPphxnHWrXuuF0EAy2t%2FhuZmgbVwr5x6JuFzEE%2BFuTFVKArgkHBWaacH0Hj<SITE_PASS>0t2U%2B74l%0D%0ANTRRTg3UDVMAuxmXnK%2FpOROXPTrVy3j87HmgQ6BTEmnjulx<SITE_PASS>A06JSkEcLRCfMXQY8u3JzJxOQwv6%0D%0Aqt%2BFhcf0YjGMDYeYzam9SxNNN3%2B0begv5NvScweD7u%2BtIVA0<SITE_PASS>KRue5Q7Zz9HsXVrWTamVl2%2BVirB%0D%0AIrdw3mfJSV%2Bml5QUa4uckZmXdShan<SITE_PASS>L3KnJcsFeQWsQW7bWBBXFzcMrSgh3FyFxm7qUYxMFuuBzJ%0D%0AUCYdLY%2FnGdgtr3dPoNBuIRszyTQKfrho5w<SITE_PASS>cBs9ec7eL%2FD4X5FyqzPBZSeG6jGLtuD%2FOH%2BqNS%2BgH%0D%0AoT%2FJhwuogfIC0hLLBluezVOkXTxlliYRYdaxkB46rteNHR8c833gxuUBY7bKxUs7mT4ftXP%2B4De4%0D%0AHBOwQ<SITE_PASS><SITE_PASS>KL%2BFpE8W0PrX3f%2FbuF%2FLq68hXr%2F9zCnxeQT%2FvzdOt6ft9%2Bt%2FDNsF7%0D%0A&MD=a6ae35ca097e266b<SITE_PASS><SITE_PASS>e<SITE_PASS>8024f000034d&ShopID=<SHOP_ID>&ShopPass=<SHOP_PASS>
     headers:
       Accept-Encoding:
@@ -29,7 +29,7 @@ http_interactions:
       Connection:
       - close
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: OrderID=Darren-test-202<SITE_PASS>030<SITE_PASS><SITE_PASS>022<SITE_PASS>8&Forward=2a99662&Method=<SITE_PASS>&PayTimes=&Approve=
         004536&TranID=2<SITE_PASS>030<SITE_PASS><SITE_PASS>003<SITE_PASS><SITE_PASS><SITE_PASS><SITE_PASS><SITE_PASS><SITE_PASS><SITE_PASS><SITE_PASS><SITE_PASS><SITE_PASS><SITE_PASS><SITE_PASS>8<SITE_PASS>075<SITE_PASS>&TranDate=202<SITE_PASS>030<SITE_PASS><SITE_PASS>02444&CheckString=54686df6bad0b4ca3366024c7806ff66
   recorded_at: Mon, 01 Mar 2021 01:24:44 GMT
diff --git a/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_void_tran_brandtoken_gets_data_about_order.yml b/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_void_tran_brandtoken_gets_data_about_order.yml
index bc8bb42..cf7b04e 100644
--- a/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_void_tran_brandtoken_gets_data_about_order.yml
+++ b/fixtures/vcr_cassettes/GMO_Payment_ShopAPI/_void_tran_brandtoken_gets_data_about_order.yml
@@ -4,7 +4,7 @@ http_interactions:
     method: post
     uri: https://<HOST>/payment/EntryTranBrandtoken.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: OrderID=<SHOP_PASS>502<SHOP_PASS>89293&JobCd=AUTH&Amount=<SHOP_PASS>00&ShopID=<SHOP_ID>&ShopPass=<SHOP_PASS>
     headers:
       Accept-Encoding:
@@ -31,7 +31,7 @@ http_interactions:
       Content-Language:
       - ja-JP
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: AccessID=<SHOP_PASS>da06<SHOP_PASS>87345d6<SHOP_PASS>3ce206f4cd05bc5322&AccessPass=45a2<SHOP_PASS>e63323c3795d26e22338eaa6b7f
     http_version:
   recorded_at: Tue, 08 Aug 2017 10:48:14 GMT
@@ -39,7 +39,7 @@ http_interactions:
     method: post
     uri: https://<HOST>/payment/ExecTranBrandtoken.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: OrderID=<SHOP_PASS>502<SHOP_PASS>78987&AccessID=<SHOP_PASS>da06<SHOP_PASS>87345d6<SHOP_PASS>3ce206f4cd05bc5322&AccessPass=45a2<SHOP_PASS>e63323c3795d26e22338eaa6b7f&TokenType=APay&Token=base64encodedtoken&ShopID=<SHOP_ID>&ShopPass=<SHOP_PASS>
     headers:
       Accept-Encoding:
@@ -66,7 +66,7 @@ http_interactions:
       Content-Language:
       - ja-JP
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: Status=AUTH&OrderID=597ae8c36<SHOP_PASS>20b23a3c000<SHOP_PASS>4e&Forward=2a99663&Approve=5487394&TranID=<SHOP_PASS>70728<SHOP_PASS>634<SHOP_PASS><SHOP_PASS><SHOP_PASS><SHOP_PASS><SHOP_PASS><SHOP_PASS><SHOP_PASS><SHOP_PASS><SHOP_PASS><SHOP_PASS><SHOP_PASS><SHOP_PASS>77<SHOP_PASS>2<SHOP_PASS>6&TranDate=20<SHOP_PASS>70728<SHOP_PASS>63453&ClientField<SHOP_PASS>=client_field<SHOP_PASS>&ClientField2=&ClientField3=
     http_version:
   recorded_at: Tue, 08 Aug 2017 07:56:28 GMT
@@ -74,7 +74,7 @@ http_interactions:
     method: post
     uri: https://<HOST>/payment/VoidTranBrandtoken.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: OrderID=<SHOP_PASS>502<SHOP_PASS>89054&AccessID=<SHOP_PASS>da06<SHOP_PASS>87345d6<SHOP_PASS>3ce206f4cd05bc5322&AccessPass=45a2<SHOP_PASS>e63323c3795d26e22338eaa6b7f&ShopID=<SHOP_ID>&ShopPass=<SHOP_PASS>
     headers:
       Accept-Encoding:
@@ -101,7 +101,7 @@ http_interactions:
       Content-Language:
       - ja-JP
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: AccessID=21170701482c86c3b88ff72b83bfd363&AccessPass=51f36feba120de1e6e29532e5a3a5e3e&Status=CAPTURE&Forward=2a99663&Approve=5538477&TranID=1707311633111111111111771224&TranDate=20170731163343
     http_version:
   recorded_at: Tue, 08 Aug 2017 10:44:15 GMT
diff --git a/fixtures/vcr_cassettes/GMO_Payment_ShopAndSiteAPI/_exec_tran_brandtoken_got_data.yml b/fixtures/vcr_cassettes/GMO_Payment_ShopAndSiteAPI/_exec_tran_brandtoken_got_data.yml
index 1a956e7..87b772a 100644
--- a/fixtures/vcr_cassettes/GMO_Payment_ShopAndSiteAPI/_exec_tran_brandtoken_got_data.yml
+++ b/fixtures/vcr_cassettes/GMO_Payment_ShopAndSiteAPI/_exec_tran_brandtoken_got_data.yml
@@ -4,7 +4,7 @@ http_interactions:
     method: post
     uri: https://<HOST>/payment/EntryTranBrandtoken.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: OrderID=<SHOP_PASS>502<SHOP_PASS>77398&JobCd=AUTH&Amount=<SHOP_PASS>00&ShopID=<SHOP_ID>&ShopPass=<SHOP_PASS>
     headers:
       Accept-Encoding:
@@ -31,7 +31,7 @@ http_interactions:
       Content-Language:
       - ja-JP
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: AccessID=<SHOP_PASS>da06<SHOP_PASS>87345d6<SHOP_PASS>3ce206f4cd05bc5322&AccessPass=45a2<SHOP_PASS>e63323c3795d26e22338eaa6b7f
     http_version:
   recorded_at: Tue, 08 Aug 2017 07:29:59 GMT
@@ -39,7 +39,7 @@ http_interactions:
     method: post
     uri: https://<HOST>/payment/ExecTranBrandtoken.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: OrderID=<SHOP_PASS>502<SHOP_PASS>77572&AccessID=<SHOP_PASS>da06<SHOP_PASS>87345d6<SHOP_PASS>3ce206f4cd05bc5322&AccessPass=45a2<SHOP_PASS>e63323c3795d26e22338eaa6b7f&TokenType=APay&Token=base64encodedtoken&MemberID=<SHOP_PASS>502<SHOP_PASS>77572&ShopID=<SHOP_ID>&ShopPass=<SHOP_PASS>&SiteID=<SITE_ID>&SitePass=<SHOP_PASS>
     headers:
       Accept-Encoding:
@@ -66,7 +66,7 @@ http_interactions:
       Content-Language:
       - ja-JP
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: Status=AUTH&OrderID=<SHOP_PASS>502<SHOP_PASS>77572&Forward=2a99663&Approve=5487394&TranID=<SHOP_PASS>70728<SHOP_PASS>634<SHOP_PASS><SHOP_PASS><SHOP_PASS><SHOP_PASS><SHOP_PASS><SHOP_PASS><SHOP_PASS><SHOP_PASS><SHOP_PASS><SHOP_PASS><SHOP_PASS><SHOP_PASS>77<SHOP_PASS>2<SHOP_PASS>6&TranDate=20<SHOP_PASS>70728<SHOP_PASS>63453&ClientField<SHOP_PASS>=&ClientField2=&ClientField3=
     http_version:
   recorded_at: Tue, 08 Aug 2017 07:32:53 GMT
diff --git a/fixtures/vcr_cassettes/GMO_Payment_ShopAndSiteAPI/_register_recurring_credit_got_data.yml b/fixtures/vcr_cassettes/GMO_Payment_ShopAndSiteAPI/_register_recurring_credit_got_data.yml
index 80ab7e7..348d51a 100644
--- a/fixtures/vcr_cassettes/GMO_Payment_ShopAndSiteAPI/_register_recurring_credit_got_data.yml
+++ b/fixtures/vcr_cassettes/GMO_Payment_ShopAndSiteAPI/_register_recurring_credit_got_data.yml
@@ -4,7 +4,7 @@ http_interactions:
     method: post
     uri: https://<HOST>/payment/RegisterRecurringCredit.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: RecurringID=<TOKEN>53596492<TOKEN>&Amount=<TOKEN>00&ChargeDay=3<TOKEN>&RegistType=<TOKEN>&MemberID=smama_development_user_<TOKEN>&SiteID=<SITE_ID>&SitePass=<SITE_PASS>&ShopID=<SHOP_ID>&ShopPass=<SHOP_PASS>
     headers:
       Accept-Encoding:
@@ -29,7 +29,7 @@ http_interactions:
       Connection:
       - close
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: ShopID=<SHOP_ID>&RecurringID=<TOKEN>53596492<TOKEN>&Amount=<TOKEN>00&Tax=0&ChargeDay=3<TOKEN>&ChargeMonth=0<TOKEN>|02|03|04|05|06|07|08|09|<TOKEN>0|<TOKEN><TOKEN>|<TOKEN>2&ChargeStartDate=20<TOKEN>80904&ChargeStopDate=&NextChargeDate=20<TOKEN>80930&Method=RECURRING_CREDIT&CardNo=&Expire=&SiteID=<SITE_ID>&MemberID=smama_development_user_<TOKEN>
     http_version: 
   recorded_at: Mon, 03 Sep 2018 08:55:22 GMT
diff --git a/fixtures/vcr_cassettes/GMO_Payment_ShopAndSiteAPI/_trade_brandtoken_got_data.yml b/fixtures/vcr_cassettes/GMO_Payment_ShopAndSiteAPI/_trade_brandtoken_got_data.yml
index b7b7fa1..5e28944 100644
--- a/fixtures/vcr_cassettes/GMO_Payment_ShopAndSiteAPI/_trade_brandtoken_got_data.yml
+++ b/fixtures/vcr_cassettes/GMO_Payment_ShopAndSiteAPI/_trade_brandtoken_got_data.yml
@@ -4,7 +4,7 @@ http_interactions:
     method: post
     uri: https://<HOST>/payment/EntryTranBrandtoken.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: OrderID=<SHOP_PASS>502<SHOP_PASS>77398&JobCd=AUTH&Amount=<SHOP_PASS>00&ShopID=<SHOP_ID>&ShopPass=<SHOP_PASS>
     headers:
       Accept-Encoding:
@@ -31,7 +31,7 @@ http_interactions:
       Content-Language:
       - ja-JP
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: AccessID=<SHOP_PASS>da06<SHOP_PASS>87345d6<SHOP_PASS>3ce206f4cd05bc5322&AccessPass=45a2<SHOP_PASS>e63323c3795d26e22338eaa6b7f
     http_version:
   recorded_at: Tue, 08 Aug 2017 07:29:59 GMT
@@ -39,7 +39,7 @@ http_interactions:
     method: post
     uri: https://<HOST>/payment/ExecTranBrandtoken.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: OrderID=<SHOP_PASS>502<SHOP_PASS>77572&AccessID=<SHOP_PASS>da06<SHOP_PASS>87345d6<SHOP_PASS>3ce206f4cd05bc5322&AccessPass=45a2<SHOP_PASS>e63323c3795d26e22338eaa6b7f&TokenType=APay&Token=base64encodedtoken&MemberID=<SHOP_PASS>502<SHOP_PASS>77572&ShopID=<SHOP_ID>&ShopPass=<SHOP_PASS>&SiteID=<SITE_ID>&SitePass=<SHOP_PASS>
     headers:
       Accept-Encoding:
@@ -66,7 +66,7 @@ http_interactions:
       Content-Language:
       - ja-JP
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: Status=AUTH&OrderID=<SHOP_PASS>502<SHOP_PASS>77572&Forward=2a99663&Approve=5487394&TranID=<SHOP_PASS>70728<SHOP_PASS>634<SHOP_PASS><SHOP_PASS><SHOP_PASS><SHOP_PASS><SHOP_PASS><SHOP_PASS><SHOP_PASS><SHOP_PASS><SHOP_PASS><SHOP_PASS><SHOP_PASS><SHOP_PASS>77<SHOP_PASS>2<SHOP_PASS>6&TranDate=20<SHOP_PASS>70728<SHOP_PASS>63453&ClientField<SHOP_PASS>=&ClientField2=&ClientField3=
     http_version:
   recorded_at: Tue, 08 Aug 2017 07:32:53 GMT
@@ -74,7 +74,7 @@ http_interactions:
     method: post
     uri: https://<HOST>/payment/TradedBrandtoken.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: OrderID=<SHOP_PASS>502<SHOP_PASS>77838&MemberID=<SHOP_PASS>502<SHOP_PASS>77838&ShopID=<SHOP_ID>&ShopPass=<SHOP_PASS>&SiteID=<SITE_ID>&SitePass=<SHOP_PASS>
     headers:
       Accept-Encoding:
@@ -101,7 +101,7 @@ http_interactions:
       Content-Language:
       - ja-JP
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: TokenSeq=0&CardNoToken=*************111&Forward=2a99663
     http_version:
   recorded_at: Tue, 08 Aug 2017 07:37:18 GMT
diff --git a/fixtures/vcr_cassettes/GMO_Payment_ShopAndSiteAPI/_trade_card_got_data.yml b/fixtures/vcr_cassettes/GMO_Payment_ShopAndSiteAPI/_trade_card_got_data.yml
index d007085..a1e0138 100644
--- a/fixtures/vcr_cassettes/GMO_Payment_ShopAndSiteAPI/_trade_card_got_data.yml
+++ b/fixtures/vcr_cassettes/GMO_Payment_ShopAndSiteAPI/_trade_card_got_data.yml
@@ -4,7 +4,7 @@ http_interactions:
     method: post
     uri: https://<HOST>/payment/EntryTran.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: OrderID=1371958258&JobCd=AUTH&Amount=100&ShopID=<SHOP_ID>&ShopPass=<SHOP_PASS>
     headers:
       Accept-Encoding:
@@ -27,7 +27,7 @@ http_interactions:
       Transfer-Encoding:
       - chunked
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: AccessID=1da06187345d613ce206f4cd05bc5322&AccessPass=45a21e63323c3795d26e22338eaa6b7f
     http_version:
   recorded_at: Sun, 23 Jun 2013 03:30:59 GMT
@@ -35,7 +35,7 @@ http_interactions:
     method: post
     uri: https://<HOST>/payment/ExecTran.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: OrderID=1371958258&AccessID=1da06187345d613ce206f4cd05bc5322&AccessPass=45a21e63323c3795d26e22338eaa6b7f&Method=1&PayTimes=1&CardNo=4111111111111111&Expire=1405&ClientFieldFlag=0&DeviceCategory=0&ShopID=<SHOP_ID>&ShopPass=<SHOP_PASS>
     headers:
       Accept-Encoding:
@@ -58,7 +58,7 @@ http_interactions:
       Transfer-Encoding:
       - chunked
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: ACS=0&OrderID=1371958258&Forward=2a99662&Method=1&PayTimes=&Approve=7214787&TranID=1306231226111111111111199359&TranDate=20130623123059&CheckString=74f54b788565f291e65f67c606f90ca2
     http_version:
   recorded_at: Sun, 23 Jun 2013 03:30:59 GMT
@@ -66,7 +66,7 @@ http_interactions:
     method: post
     uri: https://<HOST>/payment/SaveMember.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: MemberID=1371958259&MemberName=John+Smith&SiteID=<SITE_ID>&SitePass=<SITE_PASS>
     headers:
       Accept-Encoding:
@@ -89,7 +89,7 @@ http_interactions:
       Transfer-Encoding:
       - chunked
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: MemberID=1371958259
     http_version:
   recorded_at: Sun, 23 Jun 2013 03:30:59 GMT
@@ -97,7 +97,7 @@ http_interactions:
     method: post
     uri: https://<HOST>/payment/TradedCard.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: OrderID=1371958258&MemberID=1371958259&ShopID=<SHOP_ID>&ShopPass=<SHOP_PASS>&SiteID=<SITE_ID>&SitePass=<SITE_PASS>
     headers:
       Accept-Encoding:
@@ -120,7 +120,7 @@ http_interactions:
       Transfer-Encoding:
       - chunked
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: CardSeq=0&CardNo=************1111&Forward=2a99662
     http_version:
   recorded_at: Sun, 23 Jun 2013 03:31:00 GMT
diff --git a/fixtures/vcr_cassettes/GMO_Payment_ShopAndSiteAPI/_trade_card_got_error_if_missing_options.yml b/fixtures/vcr_cassettes/GMO_Payment_ShopAndSiteAPI/_trade_card_got_error_if_missing_options.yml
index 75446d7..8512ee1 100644
--- a/fixtures/vcr_cassettes/GMO_Payment_ShopAndSiteAPI/_trade_card_got_error_if_missing_options.yml
+++ b/fixtures/vcr_cassettes/GMO_Payment_ShopAndSiteAPI/_trade_card_got_error_if_missing_options.yml
@@ -4,7 +4,7 @@ http_interactions:
     method: post
     uri: https://<HOST>/payment/TradedCard.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: OrderID=null&MemberID=null&SeqMode=0&DefaultFlag=0&ShopID=<SHOP_ID>&ShopPass=<SHOP_PASS>&SiteID=<SITE_ID>&SitePass=<SITE_PASS>
     headers:
       Accept:
diff --git a/fixtures/vcr_cassettes/GMO_Payment_ShopAndSiteAPI/_unregister_recurring_success_unregister.yml b/fixtures/vcr_cassettes/GMO_Payment_ShopAndSiteAPI/_unregister_recurring_success_unregister.yml
index 0c607eb..b1e8aeb 100644
--- a/fixtures/vcr_cassettes/GMO_Payment_ShopAndSiteAPI/_unregister_recurring_success_unregister.yml
+++ b/fixtures/vcr_cassettes/GMO_Payment_ShopAndSiteAPI/_unregister_recurring_success_unregister.yml
@@ -4,7 +4,7 @@ http_interactions:
     method: post
     uri: https://<HOST>/payment/RegisterRecurringCredit.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: RecurringID=<TOKEN>536039393&Amount=<TOKEN>00&ChargeDay=3<TOKEN>&RegistType=<TOKEN>&MemberID=smama_development_user_<TOKEN>&SiteID=<SITE_ID>&SitePass=<SITE_PASS>&ShopID=<SHOP_ID>&ShopPass=<SHOP_PASS>
     headers:
       Accept-Encoding:
@@ -29,7 +29,7 @@ http_interactions:
       Connection:
       - close
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: ShopID=<SHOP_ID>&RecurringID=<TOKEN>536039393&Amount=<TOKEN>00&Tax=0&ChargeDay=3<TOKEN>&ChargeMonth=0<TOKEN>|02|03|04|05|06|07|08|09|<TOKEN>0|<TOKEN><TOKEN>|<TOKEN>2&ChargeStartDate=20<TOKEN>80905&ChargeStopDate=&NextChargeDate=20<TOKEN>80930&Method=RECURRING_CREDIT&CardNo=&Expire=&SiteID=<SITE_ID>&MemberID=smama_development_user_<TOKEN>
     http_version: 
   recorded_at: Tue, 04 Sep 2018 05:36:34 GMT
@@ -37,7 +37,7 @@ http_interactions:
     method: post
     uri: https://<HOST>/payment/UnregisterRecurring.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: RecurringID=<TOKEN>536039393&SiteID=<SITE_ID>&SitePass=<SITE_PASS>&ShopID=<SHOP_ID>&ShopPass=<SHOP_PASS>
     headers:
       Accept-Encoding:
@@ -62,7 +62,7 @@ http_interactions:
       Connection:
       - close
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: ShopID=<SHOP_ID>&RecurringID=<TOKEN>536039393&Amount=<TOKEN>00&Tax=0&ChargeDay=3<TOKEN>&ChargeMonth=0<TOKEN>|02|03|04|05|06|07|08|09|<TOKEN>0|<TOKEN><TOKEN>|<TOKEN>2&ChargeStartDate=20<TOKEN>80905&ChargeStopDate=&NextChargeDate=&Method=RECURRING_CREDIT&CardNo=&Expire=&SiteID=<SITE_ID>&MemberID=smama_development_user_<TOKEN>&PrintStr=
     http_version: 
   recorded_at: Tue, 04 Sep 2018 05:36:34 GMT
diff --git a/fixtures/vcr_cassettes/GMO_Payment_SiteAPI/_delete_brandtoken_gets_data_about_a_brandtoken.yml b/fixtures/vcr_cassettes/GMO_Payment_SiteAPI/_delete_brandtoken_gets_data_about_a_brandtoken.yml
index 27f8a78..97183ff 100644
--- a/fixtures/vcr_cassettes/GMO_Payment_SiteAPI/_delete_brandtoken_gets_data_about_a_brandtoken.yml
+++ b/fixtures/vcr_cassettes/GMO_Payment_SiteAPI/_delete_brandtoken_gets_data_about_a_brandtoken.yml
@@ -4,7 +4,7 @@ http_interactions:
     method: post
     uri: https://<HOST>/payment/TradedBrandtoken.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: OrderID=<SHOP_PASS>502<SHOP_PASS>9<SHOP_PASS>295&MemberID=<SHOP_PASS>502<SHOP_PASS>9<SHOP_PASS>295&ShopID=<SHOP_ID>&ShopPass=<SHOP_PASS>&SiteID=<SITE_ID>&SitePass=<SHOP_PASS>
     headers:
       Accept-Encoding:
@@ -31,7 +31,7 @@ http_interactions:
       Content-Language:
       - ja-JP
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: TokenSeq=0&CardNoToken=*************<SHOP_PASS><SHOP_PASS><SHOP_PASS>&Forward=2a99663
     http_version:
   recorded_at: Tue, 08 Aug 2017 11:21:35 GMT
@@ -39,7 +39,7 @@ http_interactions:
     method: post
     uri: https://<HOST>/payment/DeleteBrandtoken.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: MemberID=<SHOP_PASS>502<SHOP_PASS>9<SHOP_PASS>329&SeqMode=0&TokenSeq=0&SiteID=<SITE_ID>&SitePass=<SHOP_PASS>
     headers:
       Accept-Encoding:
@@ -66,7 +66,7 @@ http_interactions:
       Content-Language:
       - ja-JP
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: TokenSeq=0
     http_version:
   recorded_at: Tue, 08 Aug 2017 11:22:09 GMT
diff --git a/fixtures/vcr_cassettes/GMO_Payment_SiteAPI/_delete_card_gets_data_about_a_card.yml b/fixtures/vcr_cassettes/GMO_Payment_SiteAPI/_delete_card_gets_data_about_a_card.yml
index 4858804..bdb014c 100644
--- a/fixtures/vcr_cassettes/GMO_Payment_SiteAPI/_delete_card_gets_data_about_a_card.yml
+++ b/fixtures/vcr_cassettes/GMO_Payment_SiteAPI/_delete_card_gets_data_about_a_card.yml
@@ -4,7 +4,7 @@ http_interactions:
     method: post
     uri: https://<HOST>/payment/DeleteCard.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: MemberID=1362106780&CardSeq=0&SiteID=<SITE_ID>&SitePass=<SITE_PASS>
     headers:
       Accept:
diff --git a/fixtures/vcr_cassettes/GMO_Payment_SiteAPI/_delete_member_gets_data_about_a_member.yml b/fixtures/vcr_cassettes/GMO_Payment_SiteAPI/_delete_member_gets_data_about_a_member.yml
index fcf0798..e8776ca 100644
--- a/fixtures/vcr_cassettes/GMO_Payment_SiteAPI/_delete_member_gets_data_about_a_member.yml
+++ b/fixtures/vcr_cassettes/GMO_Payment_SiteAPI/_delete_member_gets_data_about_a_member.yml
@@ -4,7 +4,7 @@ http_interactions:
     method: post
     uri: https://<HOST>/payment/SaveMember.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: MemberID=1362106781&MemberName=John+Smith&SiteID=<SITE_ID>&SitePass=<SITE_PASS>
     headers:
       Accept:
@@ -33,7 +33,7 @@ http_interactions:
     method: post
     uri: https://<HOST>/payment/DeleteMember.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: MemberID=1362106781&SiteID=<SITE_ID>&SitePass=<SITE_PASS>
     headers:
       Accept:
diff --git a/fixtures/vcr_cassettes/GMO_Payment_SiteAPI/_save_card_doesn_t_require_card_info_if_token_is_present.yml b/fixtures/vcr_cassettes/GMO_Payment_SiteAPI/_save_card_doesn_t_require_card_info_if_token_is_present.yml
index 39457bb..f3b2708 100644
--- a/fixtures/vcr_cassettes/GMO_Payment_SiteAPI/_save_card_doesn_t_require_card_info_if_token_is_present.yml
+++ b/fixtures/vcr_cassettes/GMO_Payment_SiteAPI/_save_card_doesn_t_require_card_info_if_token_is_present.yml
@@ -4,7 +4,7 @@ http_interactions:
     method: post
     uri: https://<HOST>/payment/SaveCard.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: MemberID=<TOKEN_MEMBER_ID>&Token=<TOKEN>&SiteID=<SITE_ID>&SitePass=<SITE_PASS>
     headers:
       Accept-Encoding:
@@ -29,7 +29,7 @@ http_interactions:
       Connection:
       - close
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: CardSeq=0&CardNo=*************111&Forward=2a99662
     http_version: 
   recorded_at: Fri, 03 Feb 2017 09:42:25 GMT
diff --git a/fixtures/vcr_cassettes/GMO_Payment_SiteAPI/_save_card_gets_data_about_a_card.yml b/fixtures/vcr_cassettes/GMO_Payment_SiteAPI/_save_card_gets_data_about_a_card.yml
index dcf8a3b..caf58be 100644
--- a/fixtures/vcr_cassettes/GMO_Payment_SiteAPI/_save_card_gets_data_about_a_card.yml
+++ b/fixtures/vcr_cassettes/GMO_Payment_SiteAPI/_save_card_gets_data_about_a_card.yml
@@ -4,7 +4,7 @@ http_interactions:
     method: post
     uri: https://<HOST>/payment/SaveCard.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: MemberID=1362106780&CardNo=4111111111111111&Expire=1405&SiteID=<SITE_ID>&SitePass=<SITE_PASS>
     headers:
       Accept:
diff --git a/fixtures/vcr_cassettes/GMO_Payment_SiteAPI/_save_member_gets_data_about_a_transaction.yml b/fixtures/vcr_cassettes/GMO_Payment_SiteAPI/_save_member_gets_data_about_a_transaction.yml
index 98557bb..e31bd17 100644
--- a/fixtures/vcr_cassettes/GMO_Payment_SiteAPI/_save_member_gets_data_about_a_transaction.yml
+++ b/fixtures/vcr_cassettes/GMO_Payment_SiteAPI/_save_member_gets_data_about_a_transaction.yml
@@ -4,7 +4,7 @@ http_interactions:
     method: post
     uri: https://<HOST>/payment/SaveMember.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: MemberID=1362106780&MemberName=John+Smith&SiteID=<SITE_ID>&SitePass=<SITE_PASS>
     headers:
       Accept:
diff --git a/fixtures/vcr_cassettes/GMO_Payment_SiteAPI/_search_brandtoken_gets_data_about_a_brandtoken.yml b/fixtures/vcr_cassettes/GMO_Payment_SiteAPI/_search_brandtoken_gets_data_about_a_brandtoken.yml
index 0306998..19234f3 100644
--- a/fixtures/vcr_cassettes/GMO_Payment_SiteAPI/_search_brandtoken_gets_data_about_a_brandtoken.yml
+++ b/fixtures/vcr_cassettes/GMO_Payment_SiteAPI/_search_brandtoken_gets_data_about_a_brandtoken.yml
@@ -4,7 +4,7 @@ http_interactions:
     method: post
     uri: https://<HOST>/payment/TradedBrandtoken.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: OrderID=<SHOP_PASS>502<SHOP_PASS>90974&MemberID=<SHOP_PASS>502<SHOP_PASS>90974&ShopID=<SHOP_ID>&ShopPass=<SHOP_PASS>&SiteID=<SITE_ID>&SitePass=<SHOP_PASS>
     headers:
       Accept-Encoding:
@@ -32,7 +32,7 @@ http_interactions:
       Content-Language:
       - ja-JP
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: TokenSeq=0&CardNoToken=*************<SHOP_PASS><SHOP_PASS><SHOP_PASS>&Forward=2a99663
     http_version:
   recorded_at: Tue, 08 Aug 2017 11:16:15 GMT
@@ -40,7 +40,7 @@ http_interactions:
     method: post
     uri: https://<HOST>/payment/SearchBrandtoken.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: MemberID=<SHOP_PASS>502<SHOP_PASS>9<SHOP_PASS><SHOP_PASS><SHOP_PASS>7&SeqMode=0&SiteID=<SITE_ID>&SitePass=<SHOP_PASS>
     headers:
       Accept-Encoding:
@@ -67,7 +67,7 @@ http_interactions:
       Content-Language:
       - ja-JP
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: TokenSeq=0&DefaultFlag=0&CardName=&CardNoToken=*************111&Expire=2212&HolderName=&DeleteFlag=0
     http_version:
   recorded_at: Tue, 08 Aug 2017 11:18:38 GMT
diff --git a/fixtures/vcr_cassettes/GMO_Payment_SiteAPI/_search_card_detail_by_member_id_gets_data_about_card_detail.yml b/fixtures/vcr_cassettes/GMO_Payment_SiteAPI/_search_card_detail_by_member_id_gets_data_about_card_detail.yml
index a0bacd1..33bb197 100644
--- a/fixtures/vcr_cassettes/GMO_Payment_SiteAPI/_search_card_detail_by_member_id_gets_data_about_card_detail.yml
+++ b/fixtures/vcr_cassettes/GMO_Payment_SiteAPI/_search_card_detail_by_member_id_gets_data_about_card_detail.yml
@@ -4,7 +4,7 @@ http_interactions:
     method: post
     uri: https://pt0<SHOP_PASS>.mul-pay.jp/payment/SearchCardDetail.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: MemberID=50292464&SeqMode=0&ShopID=<SHOP_ID>&ShopPass=<SHOP_PASS>
     headers:
       Accept-Encoding:
diff --git a/fixtures/vcr_cassettes/GMO_Payment_SiteAPI/_search_card_gets_data_about_a_card.yml b/fixtures/vcr_cassettes/GMO_Payment_SiteAPI/_search_card_gets_data_about_a_card.yml
index 5c6432e..3c8b991 100644
--- a/fixtures/vcr_cassettes/GMO_Payment_SiteAPI/_search_card_gets_data_about_a_card.yml
+++ b/fixtures/vcr_cassettes/GMO_Payment_SiteAPI/_search_card_gets_data_about_a_card.yml
@@ -4,7 +4,7 @@ http_interactions:
     method: post
     uri: https://<HOST>/payment/SaveCard.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: MemberID=1362106780&CardNo=4111111111111111&Expire=1405&SiteID=<SITE_ID>&SitePass=<SITE_PASS>
     headers:
       Accept:
@@ -33,7 +33,7 @@ http_interactions:
     method: post
     uri: https://<HOST>/payment/SearchCard.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: MemberID=1362106780&CardSeq=0&SeqMode=0&SiteID=<SITE_ID>&SitePass=<SITE_PASS>
     headers:
       Accept:
diff --git a/fixtures/vcr_cassettes/GMO_Payment_SiteAPI/_search_member_gets_data_about_a_member.yml b/fixtures/vcr_cassettes/GMO_Payment_SiteAPI/_search_member_gets_data_about_a_member.yml
index 5eaad5f..f8db485 100644
--- a/fixtures/vcr_cassettes/GMO_Payment_SiteAPI/_search_member_gets_data_about_a_member.yml
+++ b/fixtures/vcr_cassettes/GMO_Payment_SiteAPI/_search_member_gets_data_about_a_member.yml
@@ -4,7 +4,7 @@ http_interactions:
     method: post
     uri: https://<HOST>/payment/SaveMember.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: MemberID=1362106992&MemberName=John+Smith&SiteID=<SITE_ID>&SitePass=<SITE_PASS>
     headers:
       Accept:
@@ -33,7 +33,7 @@ http_interactions:
     method: post
     uri: https://<HOST>/payment/SearchMember.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: MemberID=1362106992&SiteID=<SITE_ID>&SitePass=<SITE_PASS>
     headers:
       Accept:
diff --git a/fixtures/vcr_cassettes/GMO_Payment_SiteAPI/_update_member_gets_data_about_a_transaction.yml b/fixtures/vcr_cassettes/GMO_Payment_SiteAPI/_update_member_gets_data_about_a_transaction.yml
index 899d018..9859d35 100644
--- a/fixtures/vcr_cassettes/GMO_Payment_SiteAPI/_update_member_gets_data_about_a_transaction.yml
+++ b/fixtures/vcr_cassettes/GMO_Payment_SiteAPI/_update_member_gets_data_about_a_transaction.yml
@@ -4,7 +4,7 @@ http_interactions:
     method: post
     uri: https://<HOST>/payment/UpdateMember.idPass
     body:
-      encoding: UTF-8
+      encoding: Windows-31J
       string: MemberID=1362106780&MemberName=John+Smith2&SiteID=<SITE_ID>&SitePass=<SITE_PASS>
     headers:
       Accept:
diff --git a/spec/gmo/shop_api_spec.rb b/spec/gmo/shop_api_spec.rb
index e1c7c3b..ab6066c 100644
--- a/spec/gmo/shop_api_spec.rb
+++ b/spec/gmo/shop_api_spec.rb
@@ -653,7 +653,7 @@
       result["Approve"].nil?.should_not be true
       result["TranID"].nil?.should_not be true
       result["TranDate"].nil?.should_not be true
-      (result["ClientField1"] == client_field_1).should be true
+      result["ClientField1"].should eq client_field_1
       result["ClientField2"].nil?.should_not be true
       result["ClientField3"].nil?.should_not be true
     end
@@ -669,7 +669,6 @@
 
       it "should correctly handle Japanese", :vcr do
         order_id = generate_id
-        client_field_1 = "〜−¢£¬−‖①ほげほげhogehoge"
         result = @service.entry_tran_brandtoken({
           :order_id => order_id,
           :job_cd => "AUTH",
@@ -683,7 +682,7 @@
           :access_pass => access_pass,
           :token_type  => :apple_pay,
           :token       => 'base64encodedtoken',
-          :client_field_1 => client_field_1
+          :client_field_1 => 'ｶｿｳｼﾃﾝ'
         })
         result["Status"].nil?.should_not be true
         result["OrderID"].nil?.should_not be true
@@ -691,8 +690,8 @@
         result["Approve"].nil?.should_not be true
         result["TranID"].nil?.should_not be true
         result["TranDate"].nil?.should_not be true
-        (result["ClientField1"] == client_field_1).should be true
-        (result["ClientField1"].encoding.to_s == "UTF-8").should be true
+        result["ClientField1"].should eq "カソウシテン"
+        result["ClientField1"].encoding.name.should eq "UTF-8"
         result["ClientField2"].nil?.should_not be true
         result["ClientField3"].nil?.should_not be true
       end