XF 1.3 payment_callback.php Missing After Upgrade to 1.3

Check the user upgrade transaction log -- are you seeing errors? (Note that if people go to that URL directly, you'll have some errors logged).
 
Check the user upgrade transaction log -- are you seeing errors? (Note that if people go to that URL directly, you'll have some errors logged).

Over 400. E.g.,

Code:
    Unknown Upgrade - Error: Request not validated Today at 7:29 AM, Unknown Account
    Stratics Pro - 12 Months - Payment: Payment received, upgraded/extended Today at 2:22 AM, Noldor
    Unknown Upgrade - Error: Request not validated Today at 1:29 AM, Unknown Account
    Unknown Upgrade - Error: Request not validated Today at 1:29 AM, Unknown Account
    Unknown Upgrade - Error: Request not validated Today at 1:16 AM, Unknown Account
    Unknown Upgrade - Error: Request not validated Today at 1:13 AM, Unknown Account
    Unknown Upgrade - Error: Invalid business or receiver_email Yesterday at 11:32 AM, Unknown Account
    Unknown Upgrade - Error: Invalid business or receiver_email Saturday at 11:32 AM, Unknown Account
    Unknown Upgrade - Error: Invalid business or receiver_email Friday at 12:46 PM, Unknown Account
    Unknown Upgrade - Error: Invalid business or receiver_email Friday at 1:24 AM, Unknown Account
    Unknown Upgrade - Error: Invalid business or receiver_email Thursday at 7:42 PM, Unknown Account
    Unknown Upgrade - Error: Invalid business or receiver_email Thursday at 4:51 PM, Unknown Account
    Unknown Upgrade - Error: Invalid business or receiver_email Thursday at 3:26 PM, Unknown Account
    Unknown Upgrade - Error: Invalid business or receiver_email Thursday at 2:43 PM, Unknown Account
    Unknown Upgrade - Error: Invalid business or receiver_email Thursday at 2:22 PM, Unknown Account
    Unknown Upgrade - Error: Invalid business or receiver_email Thursday at 2:11 PM, Unknown Account
    Unknown Upgrade - Error: Invalid business or receiver_email Thursday at 2:06 PM, Unknown Account
    Unknown Upgrade - Error: Invalid business or receiver_email Thursday at 2:03 PM, Unknown Account
    Unknown Upgrade - Error: Invalid business or receiver_email Thursday at 2:02 PM, Unknown Account
    Unknown Upgrade - Error: Invalid business or receiver_email Thursday at 2:01 PM, Unknown Account
 
Right, you can ignore the request not validated calls.

However, the invalid business or receiver_email is a legitimate error. You need to make sure that your primary PayPal account in XF is set to one of those values. (You can click on the error for more details, and you should see a business and receiver_email in the PayPal details for the transaction.)
 
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