Wouldn't the url be
https://removed.com/payment_gateway.php?method=paypal ?
ETA: actually, from the developers docs:
Quote:
Note: The IPN message will always be sent to your notification URL unless receiving IPNs have been disabled. Even though you have not enabled receiving IPN messages in your Profile or you have reset your preference by turning off IPN messages, PayPal still sends IPN messages to the notification URL you specify for a specific payment. IPN messages not sent because you disabled the preference in your Profile will appear in the IPN history when you enable receiving IPNs. After they appear in the history, you can choose whether or not to resend them.
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So, since the vb code includes the URL for each specific payment, I would think you'd want to leave that setting at "Do Not Receive IPN Messages". Are you able to look in the IPN history they mention?
I don't know anything about cloudflare, but is it possible to temporarily turn it off to see if that makes any difference?