If you’ve specified a pre-auth callback in your API call, or pre-configured it as a requirement on your installation, the API posts a callback to the endpoint specified with a payload before completing the transaction.
Your callback handler requires logic applied to read the callback and issue a response to either proceed or cancel the transaction.
'Cancelled by preauth callback' message when viewing void transactions
Our transactions are showing as void, and message 'Cancelled by preauth callback' appears.
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Written by Ollie Denning