How to use any external sumo-Traci python code or Carla script(for sensor acquisition ) in SUMO-CARLA so-simulation

[arscode]

I am trying to plug my own custom code written for sumo-traci simulation and carla sensor integration in the sumo-carla co-simulation. both working separately but I can't use them while using co-simulation using run_synchronization. I need help to understand where my codes needs to be plugged? do I have to put the codes in the sumo_simulation.py and carla_simulation.py files and use run_synchronization.py for co-simulation?