Are you on a Live server or Local? The callback.php should be on a live server.
I am on a live server and the callback.php is also on the live server.
Since the error is from the API, I suggest you do it again.
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Are you on a Live server or Local? The callback.php should be on a live server.
I am on a live server and the callback.php is also on the live server.
Since the error is from the API, I suggest you do it again.