Override the BaseAPI Client

- This allows us to set a custom header for admin calls only (not needed in client calls)
- Adds request-id from Middleware to the API call to ensure the API logs against the same request ID.

app/notify_client/__init__.py

@@ -1,4 +1,7 @@
 from flask_login import current_user
+from flask import has_request_context, request
+from notifications_python_client.base import BaseAPIClient
+from notifications_python_client.version import __version__
 
 
 def _attach_current_user(data):
@@ -6,3 +9,20 @@ def _attach_current_user(data):
         created_by=current_user.id,
         **data
     )
+
+
+class NotifyAdminAPIClient(BaseAPIClient):
+    def generate_headers(self, api_token):
+        headers = {
+            "Content-type": "application/json",
+            "Authorization": "Bearer {}".format(api_token),
+            "User-agent": "NOTIFY-API-PYTHON-CLIENT/{}".format(__version__)
+        }
+        return self._add_request_id_header(headers)
+
+    @staticmethod
+    def _add_request_id_header(headers):
+        if not has_request_context():
+            return headers
+        headers['NotifyRequestID'] = request.request_id
+        return headers