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| Note |
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When customer returns to the merchant site the value of the order number is always transmitted as URL-encoded string: all non alpha-numeric characters (except '-' and '_'.) are replaced by the percent sign '%' followed by two digits hex code; spaces are replaced by '+' sign. This is important when the order number contains characters of non latin alphabet or some special symbols. |
When using the option of a customer's return to the shop, it is recommended to sent an additional request about the authorization result to IPS Assist server after receiving data about the paid order at URL_RETURN_OK (for information about the authorization result request refer to section 3.3) in order to make sure the order payments have been performed. It is recommended as well to send an additional request about the authorization result to IPS Assist server after receiving data about the paid order at URL_RETURN and URL_RETURN_NO, because a customer is redirected to these addresses with different payment state, including the state "In process".