Meta Embedded Signup + Coexistence expert

I have already secured access to the official Meta WhatsApp Business Platform and now need hands-on guidance to integrate and configure it inside an existing web application while keeping the “coexistence” feature active (so the current WhatsApp Business App can continue to run on the same number)... (Budget: ₹400 - ₹750 INR, Jobs: API Integration, Backend Development, C# Programming, Cloud Computing, JavaScript, PHP, Security, Software Architecture, Web Application, Web Development)