An access token can then be used as an authorization token to configured web services. To use an access token to access a protected resource, the access token must be passed to the resource server.
The client should use a bearer authorization method as defined in RFC 6750 to present the access token to the resource. The most common approach is to use the HTTP Authorization header and include the access token as a Bearer authorization credential, however RFC 6750 also defines mechanisms for presenting an access token via query string and in a post body.
In the diagram below, the client presents the OAuth 2.0 access token to the protected resource (step 1). The resource then validates the access token before returning the requested resource (if authorized).