Restaurant Backend, Payment, AR Optimization

My restaurant ordering platform is already live with core features coded, yet it still needs a round of deep polishing before it can comfortably scale. Here is what remains: • Payment flow
 Customers must be able to pay the restaurant directly inside the app or website... (Budget: ₹1500 - ₹12500 INR, Jobs: Android, API Integration, Augmented Reality, iPhone, Mobile App Development, Payment Processing, PHP, Stripe)