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According to IPN Still Not Working - PayPal Community, if you are using PayPal’s IPN, you must:
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Follow the IPN authentication protocol, and
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Make a Webhook Response with the calculated response as described in the IPN authentication protocol to tell PayPal that you have verified the notification, and
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Consequently, your listener (trigger module) must not perform time-consuming operations (such as updating a database) before responding to an IPN, because PayPal expects to receive a response to an IPN message within 30 seconds
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