Update codegen to accomodate stefi endpoints

Summary: these changes are to accomodate stefi endpoints

Reviewed By: liliarizona

Differential Revision: D91635691

fbshipit-source-id: d9531e4958c56e39817f950da1db1c0c771cbfd9

Author: satwikareddy3

facebook_business/api.py

@@ -547,6 +547,7 @@ def __init__(
         node_id,
         method,
         endpoint,
+        base_path=None,
         api=None,
         param_checker=TypeChecker({}, {}),
         target_class=None,
@@ -574,7 +575,10 @@ def __init__(
         self._node_id = node_id
         self._method = method
         self._endpoint = endpoint.replace('/', '')
-        self._path = (node_id, endpoint.replace('/', ''))
+        if base_path:
+            self._path = (base_path.strip('/'), str(node_id))
+        else:
+            self._path = (node_id, endpoint.replace('/', ''))
         self._param_checker = param_checker
         self._target_class = target_class
         self._api_type = api_type