Delphi WhatsApp API Message Sender

I want a small Delphi application that talks directly to the official WhatsApp Business API so I can send on-the-fly text messages to customers who already have an active chat with my number. No browser automation, no desktop-app tricks—pure API calls... (Budget: ₹750 - ₹1250 INR, Jobs: API Development, C# Programming, Delphi, JSON, REST API, Software Architecture, SQLite, XML)