Supported Features - doorkeeper-gem/doorkeeper GitHub Wiki Here's the feature list we support from OAuth 2 Spec: The OAuth 2.0 Authorization Framework Authorization Code Flow Access Token Scopes Refresh token Implicit grant Resource Owner Password Credentials Client Credentials OAuth 2.0 Token Revocation OAuth 2.0 Token Introspection OAuth 2.0 for Native Apps Proof Key for Code Exchange by OAuth Public Clients