Build a Food Delivery Android App

Basically food delivery platforms have 3 apps, one for user, vendor and delivery boy. Here I need android app similar to Zomato, Swiggy or anyother food ordering application but without delivery app, so I need two apps one for user and another for vendor (delivery app not needed) Everything is similar to food delivery apps but few changes to be made. The Import changes needed for User app: 1. Add navigation button on the top of vendor food menu page so that if the user wants to go to the location he can navigate once he clicks the button. An external google maps will be open to show the direction 2. App should Identify and send alert notification that user reached vendor location. Logic is vendor geo location is available by default (while vendor registration) and take the current location and match. 3. Display adding quantity on menu page only when vendor is active on the vendor location. In very simple way acitivate adding quantity only when vendor is at selling location. The Import changes needed for vendor app: 1. In vendor signup form add vendor selling location option so that it can automatically get geo location codes and store so that later it will reflect on user app so that user can navigate to vendor. Other Features on Admin Panel: 1. Ads facility should be available for each pincode so that custom ads banners with internal links can be placed. 2. Ads facility should be available at checkout page for 2 banners at the bottom. 2. All payments should be splitted by some percentage automatically. So that the vendor payment can be paid to them. 3. Need payment gateway integration.