What is a Callback URL?

A Callback URL is an address where the system sends callbacks regarding transaction statuses. You must create and configure this URL yourself. It is specified in the “Settings” → “API” section of the merchant account interface.
It is not publicly accessible.
All callbacks are signed using your API keys.
The system sends a callback signed with your secret key, which must be verified before processing.
If the signature is correct, the callback is accepted. Otherwise, it cannot be processed.