Bearer Token
A Bearer Token is an opaque string used in OAuth 2.0 RFC 6750 generated by the server in response to a login request. Clients must send this token in the Authorization header when making requests to protected resources.
Authorization: Bearer <token>
All API requests using bearer tokens must be made over an HTTPS connection, since the request contains a plaintext token that could be used by anyone if it were intercepted. It can be understood as "give access to the bearer of this token."