The results of the transaction are then passed back to the merchant’s system (CallbackURL). The data passed to the Merchant’s System should be checked for errors at this point.

1. At this point, the payment processing has been completed. If the transaction was successful, money hasbeenexchangedbetweenbanks.

2. If errors occur with the results (for example; Variable Tampering), the merchant’s system should stop the transaction from going any further and move to step 12.

3. If there is an error in the payment gateway being able to reach the merchant’s system (Callback URL), an invalid URL for example, then the transaction result is displayed on the payment gateway and the customer is not redirected back to the merchant’s website and the process does not go any further.

The merchant’s system should display the transaction result to the customer (or desired error information if any occurred before this point).