Facebook Messenger: get access token of linked account
First off, I'm not looking for the access token of a facebook account. I (or my facebook messenger bot) need the access token of a linked 3rd party account. The account was successfully linked as described here: https://developers.facebook.com/docs/messenger-platform/identity/account-linking Slightly off topic: The first issue I noticed that does not meet the OIDC/OAuth2 specs is, that the redirect URI given to the /authorize endpoint expects a param " authorization_code " instead of "code" with the actual authorization code . Ok, good thing we do not use off-the-shelf software for the IdP, so