Discord-oauth2 - At the end of oAuth2, which I have been researching and reading for a long time, I finally found the way to connect with discord and get information, that's how I did it. If I'm wrong, feel free to email me so I can correct it.
Static utilitiy classes to bridge PSR-7 http messages to OAuth2 Server requests and responses. While this libray is entended for use with Slim 3, it should work with any PSR-7 compatible framework.