PaypalIPN.php - Added missing "User-Agent" string #5
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Description
I found recently that my sandbox transactions were all returning INVALID for some reason. After hours of banging my head against the wall checking my code, IPN History logs, Listener logs, etc. I found the following note in the Paypal Documentation
Ans after comparing this listener code to the official code found in the IPN Example code repository, I realized that this script was missing that user agent string. So I added it, an boom, the sandbox IPN came back as valid.
Changes