Fix csrf token error by adding JwtAuthentication.

BasketView post endpoint is raising csrf token
error because of missing JwtAuthentication class.

LEARNER-6607

lms/djangoapps/commerce/api/v0/tests/test_views.py

@@ -100,10 +100,10 @@ class BasketsViewTests(EnrollmentEventTestMixin, UserMixin, ModuleStoreTestCase)
 
     def test_login_required(self):
         """
-        The view should return HTTP 403 status if the user is not logged in.
+        The view should return HTTP 401 status if the user is not logged in.
         """
         self.client.logout()
-        self.assertEqual(403, self._post_to_view().status_code)
+        self.assertEqual(401, self._post_to_view().status_code)
 
     @ddt.data('delete', 'get', 'put')
     def test_post_required(self, method):

lms/djangoapps/commerce/api/v0/views.py

@@ -5,6 +5,7 @@ from django.urls import reverse
 from edx_rest_api_client import exceptions
 from opaque_keys import InvalidKeyError
 from opaque_keys.edx.keys import CourseKey
+from edx_rest_framework_extensions.auth.jwt.authentication import JwtAuthentication
 from rest_framework.authentication import SessionAuthentication
 from rest_framework.permissions import IsAuthenticated
 from rest_framework.status import HTTP_406_NOT_ACCEPTABLE, HTTP_409_CONFLICT
@@ -35,7 +36,9 @@ class BasketsView(APIView):
     """ Creates a basket with a course seat and enrolls users. """
 
     # LMS utilizes User.user_is_active to indicate email verification, not whether an account is active. Sigh!
-    authentication_classes = (EnrollmentCrossDomainSessionAuth, OAuth2AuthenticationAllowInactiveUser)
+    authentication_classes = (JwtAuthentication,
+                              OAuth2AuthenticationAllowInactiveUser,
+                              EnrollmentCrossDomainSessionAuth)
     permission_classes = (IsAuthenticated,)
 
     def _is_data_valid(self, request):