As per this other thread https://xenforo.com/community/threads/how-does-the-purchasable-items-system-work.140158/ I am unaware of any "Payment Profile" developer guide for XenForo.Yes, I found no results after a search for 'payment'. Its just one of those things that needs to be done. The XF team has been quite busy.
I claim it will not be easy. Likely a couple months effort for someone who does not know XF. They need to learn (at least) the following:... But first I need to make clear to them that its relatively easy to do for them. They are not going to sift trough anything.
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