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Django-paypal: IPN requests with invalid postback

I am building an e-commerce site using django-paypal to accept Paypal payments.

95% of the time, everything works flawlessly, users can pay, sandbox or not, and get what they bought.

The remaining 5% of the time, however, instead of " VERIFIED " or " INVALID " as the response code, I get: Invalid postback. (<html> <body> Fatal Failure <br> </body> </html> ) Invalid postback. (<html> <body> Fatal Failure <br> </body> </html> )

This does not allow our program to find out what to do, and therefore the payment will be confirmed on our side. EVEN THOUGHTS that the payment is marked as “full” in IPN and on the Paypal side.

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You must reflect (cancel) all parameters that Paypal sent to you intact. No corruption of the encoding. Even if odd characters sometimes appear in the data, for example, \ backslash. Accidental data corruption will cause you to notice "Invalid reverse ... Fatal failure."

For troubleshooting details, see the PP_MTS_Chad excellent tip in notify_url to never call when a customer pays a subscription

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