For Santander Rio payment method there aren’t any test data available, but you can see how it works with the payment flow given below.
Santander Rio Payment Flow
The customer enters his Email Address, Name and National Identity Document (DNI).
Please note that for Argentina the Customer Social Security Number parameter consists of DNI. For more information about the DNI please click here.
The Customer checks the deposit instructions and proceeds with the payment.
The customer logs in to his Santander Rio account by entering the document number, his Santander Rio key and his user name.
Upon completion of the payment flow the customer is redirected back to your ReturnURL.