WhatsApp CRM with Full APIs

I want a custom WhatsApp-centric CRM that lets me work from one place instead of juggling multiple tools. At its core the system must handle automated responses, solid contact management and clear analytics/reporting,... (Budget: ₹1500 - ₹12500 INR, Jobs: API Development, CRM, Mobile App Development, MySQL, Payment Processing, PHP, Software Architecture, Web Development)