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Permission to manage and to post on a social account of the User


I want to build a social media management platform that helps small-mid business and organizations to successfully manage all their social media channels. I was wondering how can I be authorized to post in their social pages?
After registration, The User has to connect his social account to our app and for it, He has to authorize our app to manage and post on his account (as you can view in this picture).

How can I do it? I created a facebook app and twitter app to have api key and token.
Is there any plugin? I need help because I’m very confused with auth0, api, plugin etc…
Thanks to all

P.S…: This is the page where I ask the User the permission to manage his social account.