diff --git a/metadata_backend/conf/conf.py b/metadata_backend/conf/conf.py
index ce058bd55..3655f82d7 100644
--- a/metadata_backend/conf/conf.py
+++ b/metadata_backend/conf/conf.py
@@ -31,10 +31,11 @@
 and inserted here in projects Dockerfile.
 """
 
+import json
 import os
 from distutils.util import strtobool
 from pathlib import Path
-from typing import Tuple
+from typing import Dict, Tuple
 
 import ujson
 from motor.motor_asyncio import AsyncIOMotorClient
@@ -171,3 +172,10 @@ def create_db_client() -> AsyncIOMotorClient:
     "publish_route": "/rpc/v2/datasets/publish_dataset",
     "catalog_pid": "urn:nbn:fi:att:data-catalog-sd",
 }
+
+# TODO: update languages. More fields could be needed
+metax_mappings: Dict = {"identifier_types": {}, "languages": {}}
+with open("metadata_backend/helpers/metax/identifier_types.json", "r") as codes:
+    codes_list = json.load(codes)["codes"]
+    for code in codes_list:
+        metax_mappings["identifier_types"][code["codeValue"].lower()] = code["uri"]
diff --git a/metadata_backend/helpers/metax/codelist_identifier_type.json b/metadata_backend/helpers/metax/identifier_types.json
similarity index 100%
rename from metadata_backend/helpers/metax/codelist_identifier_type.json
rename to metadata_backend/helpers/metax/identifier_types.json
diff --git a/tests/test_files/doi/test_doi.json b/tests/test_files/doi/test_doi.json
index 17fa355a7..d49e66d82 100644
--- a/tests/test_files/doi/test_doi.json
+++ b/tests/test_files/doi/test_doi.json
@@ -41,6 +41,81 @@
         }
       ],
       "contributorType": "Researcher"
+    },
+    {
+      "name": "Curator, Test",
+      "nameType": "Personal",
+      "givenName": "Test",
+      "familyName": "Curator",
+      "affiliation": [
+        {
+          "name": "affiliation place",
+          "schemeUri": "https://ror.org",
+          "affiliationIdentifier": "https://ror.org/test3",
+          "affiliationIdentifierScheme": "ROR"
+        }
+      ],
+      "contributorType": "Data Curator"
+    },
+    {
+      "name": "Rights, Holder",
+      "nameType": "Personal",
+      "givenName": "Rights",
+      "familyName": "Holder",
+      "affiliation": [
+        {
+          "name": "affiliation place",
+          "schemeUri": "https://ror.org",
+          "affiliationIdentifier": "https://ror.org/test3",
+          "affiliationIdentifierScheme": "ROR"
+        }
+      ],
+      "contributorType": "Rights Holder"
+    }
+  ],
+  "dates": [
+    {
+      "date": "2020-10-10/2022-01-10",
+      "dateType": "Collected"
+    },
+    {
+      "date": "2020-10-10",
+      "dateType": "Issued"
+    },
+    {
+      "date": "2022-01-10",
+      "dateType": "Updated"
+    },
+    {
+      "date": "2022-01-10",
+      "dateType": "Available"
+    }
+  ],
+  "geoLocations": [
+    {
+      "geoLocationPlace": "Helsinki"
+    },
+    {
+      "geoLocationPoint": {
+        "pointLongitude": "121.061",
+        "pointLatitude": "14.5786"
+      },
+      "geoLocationBox": {
+        "westBoundLongitude": "23.1994938494",
+        "eastBoundLongitude": "51.3195034857",
+        "southBoundLatitude": "32.6936430193",
+        "northBoundLatitude": "56.1691299506"
+      }
+    }
+  ],
+  "language": "Assamese",
+  "sizes": [
+    "30000"
+  ],
+  "alternateIdentifiers": [
+    {
+      "alternateIdentifier": "arXiv:9912.12345v2",
+      "alternateIdentifierType": "arXiv"
     }
   ]
-}
\ No newline at end of file
+}