Add has_active_subscription and can_charge fields

Author: Mohammed Hammoud

payments/api/serializers.py

@@ -36,6 +36,9 @@ class Meta:
 
 
 class CurrentSubscriptionSerializer(ModelSerializer):
+    has_active_subscription = serializers.ReadOnlyField()
+    can_charge = serializers.ReadOnlyField()
+
     class Meta:
         model = CurrentSubscription