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In order for the IPS Assist server to accept a payment authorization request, the merchant must send the following parameters:
- Merchant_ID –the merchant identifier in IPS Assist;
- OrderNumber – order number in the merchant's payment system corresponding to this payment;
- OrderAmount – purchase amount.
This is a minimum set of payment parameters that is transmitted from the merchant when the customer is redirected to the IPS Assist server, after which the customer enters personal data (full name, address, Email, telephone, etc.) and information about the payment means on the IPS Assist authorization pages.