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Payment is carried out as follows:
- the customer finds the merchant in the SSIS catalog and enters his ID;
- SSIS sends a request to IPS Assist with the specified customer ID;
- IPS Assist sends a request to the merchant asking whether it has a customer with this ID;
- the customer specifies the amount to top up the wallet and begins the payment process through SSIS;
- SSIS sends a request to IPS Assist, then payment is made according to the existing advance payment scenario (the order number is generated automatically), the customer table is not used if there is verification from the merchant;
- after payment is made through SSIS, IPS Assist sends the authorization result to the merchant server with the customer ID and credit amount, the order/operation number in a result allows you to exclude duplicates on the merchant side.
To ensure client verification, the following verification service must be implemented on the merchant side: