PayPal Instant Payment Notification - 2009 Guia do Utilizador descarregar pdf (Página 30)

IPN Testing

IPN Troubleshooting Tips

30 June, 2009 IPN Guide

z Ensure that you are encoding your response string and are using the same character

encoding as the original message.

NOTE: If you receive multiple IPN messages for the same transaction or if messages appear

to be out of order, this is not necessarily an indication that your listener is

malfunctioning. For example, if you do not respond in time, PayPal resends the

message. You should investigate these situations; however, because they could be

caused by a logic errors or performance problems as well.

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PayPal Instant Payment Notification - 2009 Guia do Utilizador Página 30