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Authorize.Net Integration: Receiving sporadic duplicate payment errorsAsked by kehillatisrael on July 28, 2016 at 04:27 PM
Several people have gotten the attached message when trying to complete our form. It's not happening every time and one parent who got this had no issue completing the form for a different child.
Please try adding a 'Unique ID' field to the form and then specify it as an 'Invoice Number Field' via Authorize.Net field properties.
Here is a quick animation:
It will indicate on the Authorize.Net side that transactions are not duplicates.
If you need any further assistance, please let us know.