WhatsApp Auto-Posting & Booking App

Hi everyone, I manage multiple WhatsApp groups where I regularly post my products. If a customer likes a product, they book it directly through the group. I want to develop an application that automates... (Budget: ₹12500 - ₹37500 INR, Jobs: Android, Android App Development, API, API Integration, App Development, Database Management, iOS Development, Mobile App Development, MySQL, PHP)