I need an experienced Meta developer to wire up the WhatsApp Business API so my system can both send and receive messages reliably. The core objective is simple: once you are done, my application must be able to push a text, media, or template message to any approved number and immediately process the incoming replies through a webhook you set up. Here is what I expect: • Complete configuration of the WhatsApp Business API (cloud or on-prem, whichever you recommend and can justify) • A clean, well-commented code module that exposes straightforward methods like sendMessage() and parseIncoming() • Secure webhook endpoint handling all standard message event types, including text, media, and status callbacks • Short, clear documentation and a quick video or screen-share walkthrough so I can reproduce the setup, refresh tokens, and move the code to production • Basic load test proving that simultaneous send/receive calls work without drops I am only focused on the “Sending and receiving messages” functionality right now; features such as broadcasting or automated chat logic may follow in a later phase, so please structure the code with that future extension in mind. If you have already navigated Meta’s App Review, verified phone numbers, and understand rate limits, you will hit the ground running. Let me know how quickly you can deliver the first working demo and what tech stack (Node, Python, PHP, etc.) you prefer—my back-end is flexible.