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Old 03-19-2020, 04:50 AM
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ambal ambal is offline

X-Cart team
Join Date: Sep 2002
Posts: 4,118

Default Re: callback unknown error

That's PayPal picked up X-Payments callback script as your main X-Cart callback script and tries to use it for other (non X-Payments) PayPal transactions as well.
The solution is to specify your X-Cart callback script as the right one in your PayPal account settings. See 29_in_PayPal_account
Sincerely yours,
Alex Mulin
VP of Business Development for X-Cart
X-Payments product manager
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