Once the payments are finalized, the customer shall be redirected to the payment status page on the merchants website. To be certain that the customer understand the reason for the potential decline of the payment, it is very much an interest of the merchant to clearly present the customer with the reason. This way the number of repeated declines or a follow-up calls from customers will be significantly reduced.
Kindly find the example of how the response code is being sent to the merchant and how it can be presented to the customer.
The full list of error-decline codes may be found on https://asxgw.com/documentation/gateway#error-codes .
If you would like to customize the response codes received from our Exchange Platform, you may find the excell document containing our suggestion / ideas on how it can be presented to the customer. This is not an official document but it can serve as a good starting point which can be customized in any way the merchant find useful.