diff --git a/apps/gooyal_oauth2/validators.py b/apps/gooyal_oauth2/validators.py
index b4c930e..7153aaf 100755
--- a/apps/gooyal_oauth2/validators.py
+++ b/apps/gooyal_oauth2/validators.py
@@ -259,3 +259,30 @@ class OAuth2Validator(BaseOAuth2Validator):  # pylint: disable=w0223
             return False
         else:
             return True
+
+    def _authenticate_request_body(self, request):
+        """
+                Try to authenticate the client using client_id and client_secret
+                parameters included in body.
+
+                Remember that this method is NOT RECOMMENDED and SHOULD be limited to
+                clients unable to directly utilize the HTTP Basic authentication scheme.
+                See rfc:`2.3.1` for more details.
+                """
+        # TODO: check if oauthlib has already unquoted client_id and client_secret
+        try:
+            client_id = request.client_id
+            client_secret = request.client_secret
+        except AttributeError:
+            return False
+
+        if self._load_application(client_id, request) is None:
+            log.debug("Failed body auth: Application %s does not exists" % client_id)
+            return False
+            # TODO: check why not work
+        elif not client_secret == request.client.client_secret:
+            log.debug("Failed body auth: wrong client secret %s" % client_secret)
+            return False
+        else:
+            return True
+