Basic support for the Spanish SERMEPA Virtual POS payment gateway provided by Servired. Used by many banks in Spain and known locally as a “TPV Virtual”.
Include this library along with the standard active merchant package and a new Integration payment gateway will be available.
Add to your Gemfile as follows:
gem 'active_merchant_sermepa'
That should automatically install a usable version of active merchant as a dependency.
This is an integrated payment gateway and as such requires all credit card details to be provided outside of your own website’s pages. The basic purchase process is:
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HTML form shown on website with payment details
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Form is submitted directly to Sermepa’s servers
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User provides credit card and completes validatation proceedures (this can be a pain in the *** for your clients if they don’t have the necessary login details, ask your bank to disable it if you get lots of complaints.)
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Optional: website receives notification from sermepa of sale result
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User forwarded back to your website. If the “Parameters in URL” (Parámetros en las URLs) option is set in the point of sale’s configuration, the user will be forwarded with a set of parameters that can be used to validate the purchase.
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Confirm that the purchase is successful using either notification or parameters in URL.
Sermepa, unlike the similar BBVA system, does not support manual requests to confirm the success of a sale. Validation must be done using the parameters received either from the notification or paremeters in forwarded URL.
Your bank should provide you with three keys, known as the “terminal id”, “commercial id”, and “secret key”. These when combined allow requests to be signed and incoming confirmations to be validated. A final option is available to set the the type of key used in the transactions. The “key type” can be set to either “sha1_complete” or “sha1_extended according to whatever is set by your bank.
These configuration options can either be set globally or on a per-request basis. The following would be included in an initializer to prepare the gateway for use:
ActiveMerchant::Billing::Integrations::Sermepa::Helper.credentials = {
:terminal_id => '9',
:commercial_id => ''999008881,
:secret_key => 'qwertyasdf0123456789',
:key_type => 'sha1_complete'
}
If the credentials are not set this way, they’ll need to be included with each call to the library’s methods.
Active Merchant provides a helper called “payment_service_for” which handles the preparation of the request to the gateway. The following code sample shows what this might look like:
= payment_service_for @invoice.transactions.last.code, 'The Shop', :amount => @invoice.total.cents, :currency => 'EUR', :service => :sermepa do |service| - service.description "Some description of the purchase" - service.customer_name @invoice.client.name - service.notify_url notify_invoice_url(@invoice) - service.success_url complete_invoice_url(@invoice) - service.failure_url complete_invoice_url(@invoice) = submit_tag "Go to payment gateway!"
A few important things to bare in mind:
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Each request to the service must have a unique transaction or order id. This is the first parameter provided to the helper.
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If a purchase fails, the order id must be updated.
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As per the Sermepa documentation the transaction id must be between 4 and 12 digits long and always start with 4 numbers.
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The credentials can be provided in the “:credentials” option to the helper if preferred.
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The URLs set where the user will be sent after the purchase.
While confirming the purchase is optional, it is highly recommended as it allows you to let the client know instantly that the transaction has completed successfully.
If HTTP notification has been enabled in the Sermepa configuration, a private request will be sent from the gateway to your website confirming the success of the transaction. The notification URL can be provided either in the form’s parameters or in the administrator configuration. You’ll most likely not be able to test this during development on your local machine for obvious reasons.
Ensuring that the parameters are provided from the returning user is much more convenient for testing and allows for an instant response to the user.
Both types work using the same parameters in the URL so can be handled with the same method.
Your controller might have a actions like in the following example:
# Receive a direct notification from the gateway def notify notify = ActiveMerchant::Billing::Integrations::Sermepa.notification(request.query_parameters) if notify.acknowledge # Do something useful end render :text => 'OK' end # Handle the incoming user def confirm notify = ActiveMerchant::Billing::Integrations::Sermepa.notification(request.query_parameters) if notify.acknowledge # do something useful render :action => 'success' else render :action => 'failure' end end
These examples are greatly simplified. It would be much better to handle these operations in a model and provide support for recording each event that takes place.
The acknowledge method also accepts a hash of credentials should you prefer this to setting them globally. It checks to see if by combining the received parameters the same signature can be generated using our secret key. Assuming the operation successful and the signature is valid, the purchase will be successful.
Written by Sam Lown.
Special thanks go to rentages.es for supporting the initial development.
Thanks should also go to floresfrescas.com for supporting the development of the BBVA TPV gateway method on which this is heavily based.
And of course, many thanks to the ActiveMerchant Shopify team for releasing this library in the first place!
Released under the MIT license.
Copyright © 2010-2011 Samuel Lown
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