I am making a donation add-on.
The problem is the following, when the user submit his payement, a POST request is mode to a page of my add-on (automaticly made by the server where the payement is made).
So it's doing :
External site -------P-O-S-T REQUEST--------> My XenForo site.
The problem, since there isn't the visitor token in the POST request the external donation site have done, I got the error : "Security error occured, please try again later.".