Defines the requested authentication method for the token endpoint. Can be none (public client without a client secret), client_secret_post (client uses HTTP POST parameters), or client_secret_basic (client uses HTTP Basic).
none
client_secret_post
client_secret_basic
Defines the requested authentication method for the token endpoint. Can be
none(public client without a client secret),client_secret_post(client uses HTTP POST parameters), orclient_secret_basic(client uses HTTP Basic).