freecalls nam4e change for api

Author: pratik-vii

metering/services.py

@@ -16,7 +16,7 @@ def get_free_call_details(self, username, org_id, service_id, group_id=None):
             total_calls = 0
 
         return {"username": username, "org_id": org_id, "service_id": service_id, "total_calls_made": total_calls,
-                "free_calls": free_calls}
+                "free_calls_allowed": free_calls}
 
     def save_usage_details(self, usage_details_dict):
         # nedd to introduce entities when we enhance  feature to this service right now directly using dicts