I want to integrate my POS system with Food Delivery

I want to create a food item in the POS system and have it displayed on the app automatically, and I want to get orders from apps to display on the admin​ panel of the POS system.
Food delivery apps that want to integrate are Grabfood, Foodpanda, Lineman and RobinHood, These are all apps that work in Thailand.

This is a POS website.
https://millionfood.app