Online aggregators Like Swiggy, Zomato ,Uber Eats and Food Panda orders & Inventory intergration with our POS System

We are looking for someone who can provide working integration code sample for integrating Online aggregators like Zomato, Swiggy, Uber Eats and Food panda orders & Inventory management (Items Availability and Price Management) with our POS System (We Working examples, samples and documentation) Purpose: We are looking into integrating our POS system (Android Platorm) with all of the major food ordering service apps, So that POS will automatically receive the orders placed with Zomato/Swiggy /Uber Eats/ Food Panda. Implementation of this can be provided by usable web services (Web APUI / WCF services) with json format as output / input, which we will either intergrate this service in POS APP (Andorid PlatForm) or fetch the use in a background service and upload it on the our central database server. Please Note we don't have any API's from any one (Swiggy, Zomato, Uber Eats, and Food Panda) We Require full and working Integration code , examples, samples and documentation. more Details for Software requirements -------------------------------------------------------------------------------------------------------------------------------------------------------- Web Service (Web API / WCF) with following methods (End Point Callers) 1 Every Resturant (Branches) technically get one unique ID with every merchants. we will pass this id as an input and service should return me all open orders pertaining to that Resturant (Outlet). 2. Online Order Status 3. Online Order Tracking 4. Inventory (Menu) Management,Take Item Offline (Make Item as Not available/Out of stock) 5. Inventory (MenuItem) Price Management 6. Fetch new Orders (with complete customer info, order id and etc) 7. Accept New orders (both type Self deliver mode [with input of delivery time] or Aggregator deliver mode ) 8. Cancel/Reject Orders 9. Raise issue for accepted order /or/ cancel from active accepted orders list. 10. mark as out for delivery / ready to deliver and Generate runners OTP