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Duplicate IPN messages received

Posted on

I recently moved IPN processing to a new server and have started seeing a number of duplicate IPN transactions.  I've not had this issue in the past and the system has run for several years without problems.  The duplicates seem to arrive up to a day apart.  Based on my log files, the handshake is working correctly and I see the verified response from the PayPal server.  I process the response immediately so the my database response time is not in play.  PayPal now hides the IPN history window for free accounts so I can't see the record of the attempts from the server side.  Other than the duplicates everything is working normally.  Suggestions?

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