OK, I have looked at one of the PayPal Express payments from when I had Auto Return switched on and the IPN failed. The PayPal website was in status "Retrying" for that payment notification until they eventually disabled my IPNs. Before PayPal disabled my IPNs the sent me a couple emails saying " PayPal Instant Payment Notification Warning.
I have followed the Zen Cart instructions to the letter for setting up IPN, but it fails for PayPal Express payments in Zen Cart 1.3.9x. I am using the correct URLs as suggested in the PayPal module.
Credit Card payments via PayPal Website Payments Pro are OK.
I have tried this using 1.3.9c. I upgraded to 1.3.9d at the weekend, so tried it with that and PayPal Express payment IPNs are still failing, i.e., they are perpetually in status "Retrying" until PayPal disable IPNs. I have tested IPN using the ipncheck.php testing tool, but that says:
Code:
IPN TESTING - Response Received via CURL -- COMMUNICATIONS OKAY
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