The general scheme of the operation
The general scheme of interaction between merchant and Internet Payment System Assist (IPS Assist) is shown on the picture:
The buyer creates the order on the pages of the merchant's web-shop. The new order number, the payment amount and the currency are assigned to order in the enterprise's system. The buyer is being redirected to the payment pages of IPS Assist with necessary payment parameters after pressing the «Buy» button.
The Order with unique number (billnumber) and passed parameters is created in IPS Assist after receiving the authorization request. Personal data (the order parameters) can be provided within the request or prompted on the IPS Assist payment pages.