migrated `include_client_id` to `prepare_request_token`

1 files changed, 12 insertions, 1 deletions

diff --git a/oauthlib/oauth2/rfc6749/clients/backend_application.py b/oauthlib/oauth2/rfc6749/clients/backend_application.py
index 99dbfc5..cd46f12 100644
--- a/oauthlib/oauth2/rfc6749/clients/backend_application.py
+++ b/oauthlib/oauth2/rfc6749/clients/backend_application.py
@@ -30,7 +30,8 @@ class BackendApplicationClient(Client):
     no additional authorization request is needed.
     """
 
-    def prepare_request_body(self, body='', scope=None, **kwargs):
+    def prepare_request_body(self, body='', scope=None,
+                             include_client_id=None, **kwargs):
         """Add the client credentials to the request body.
 
         The client makes a request to the token endpoint by adding the
@@ -41,6 +42,14 @@ class BackendApplicationClient(Client):
                      into. This may contain extra paramters. Default ''.
         :param scope:   The scope of the access request as described by
                         `Section 3.3`_.
+
+        :param include_client_id: `True` to send the `client_id` in the body of
+                                  the upstream request. Default `None`. This is
+                                  required if the client is not authenticating
+                                  with the authorization server as described
+                                  in `Section 3.2.1`_.
+        :type include_client_id: Boolean
+
         :param kwargs:  Extra credentials to include in the token request.
 
         The client MUST authenticate with the authorization server as
@@ -58,5 +67,7 @@ class BackendApplicationClient(Client):
         .. _`Section 3.3`: https://tools.ietf.org/html/rfc6749#section-3.3
         .. _`Section 3.2.1`: https://tools.ietf.org/html/rfc6749#section-3.2.1
         """
+        kwargs['client_id'] = self.client_id
+        kwargs['include_client_id'] = include_client_id
         return prepare_token_request('client_credentials', body=body,
                                      scope=scope, **kwargs)