Hobgoblin11 Posted September 14, 2010 Share Posted September 14, 2010 I am writing a listener to handle IPN notifications from paypal, and one thing I cant seemt o find anywhere - How does IPN handle pending payments, that are then completed/denied? For example, if paypal invokes my IPN once the payment is made, but pending, with a particular transaction ID, when the payment completes, does it then invoke my IPN again, with the payment status as 'completed'? If so, will this second IPN have the same transaction ID? It would seem logical that the same transaction ID is sent again, as it is actually the same customer transaction, however reading this on thepaypal website suggests otherwise: "Avoid duplicate IPN messages. Check that you have not already processed the transaction identified by the transaction ID returned in the IPN message. You may need to store transaction IDs returned by IPN messages in a file or database so that you can check for duplicates. If the transaction ID sent by PayPal is a duplicate, you should not process it again. " Help would be appreciated!! Quote Link to comment Share on other sites More sharing options...
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