modify flask app to use new service layer api [api_uses_modified_service]

Author: hjwp

entrypoints/flask_app.py

@@ -17,12 +17,14 @@
 def allocate_endpoint():
     session = get_session()
     repo = repository.SqlAlchemyRepository(session)
-    line = model.OrderLine(
-        request.json["orderid"], request.json["sku"], request.json["qty"],
-    )
-
     try:
-        batchref = services.allocate(line, repo, session)
+        batchref = services.allocate(
+            request.json["orderid"],
+            request.json["sku"],
+            request.json["qty"],
+            repo,
+            session,
+        )
     except (model.OutOfStock, services.InvalidSku) as e:
         return {"message": str(e)}, 400