Changes as per requested from code review

Move the serialize method to the billing_schema
Update variable names
Improve tests
Fix bug in command

app/billing/billing_schemas.py

@@ -1,3 +1,5 @@
+from datetime import datetime
+
 create_or_update_free_sms_fragment_limit_schema = {
     "$schema": "http://json-schema.org/draft-04/schema#",
     "description": "POST annual billing schema",
@@ -8,3 +10,17 @@ create_or_update_free_sms_fragment_limit_schema = {
     },
     "required": ["free_sms_fragment_limit"]
 }
+
+
+def serialize_ft_billing_remove_emails(data):
+    results = []
+    billed_notifications = [x for x in data if x.notification_type != 'email']
+    for notifications in billed_notifications:
+        json_result = {
+            "month": (datetime.strftime(notifications.month, "%B")),
+            "notification_type": notifications.notification_type,
+            "billing_units": int(notifications.billable_units),
+            "rate": float(notifications.rate),
+        }
+        results.append(json_result)
+    return results