How to connect WordPress & XenForo with oAuth?

[KensonPlays]

With 2.3's oAuth, how do we connect WordPress and Xenforo together? I would think this is possible now without an $80 addon (which I cannot currently afford even half that).

If someone could provide a step-by-step guide on how to get this setup, I'm sure myself and possibly hundreds more people in the future, would be extremely helpful. Preferably using a free oAuth plugin on WordPress.
How to connect WordPress & XenForo with oAuth?

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