Anyway I spent all day Sunday working on OAuth2 integration and didn't quite get it done. I got most of the backend done to generate an oauth application on the remote Pleroma. Had to get the frontend code back up and going (hadn't touched it in a while) so I can get frontend integration working.

You will put your server host and username into the frontend and it will redirect to your pleroma OAuth2 auth page, then generate a token and redirect back to my site where I collect the token and use it to confirm you really own the account.