WhatsApp Notification Layer for Website

For my existing website I need Whatsapp based. layer where you know for different kind of instances, like document upload, the signed up users should get notifications. And from there, whatsapp, they should be capable of uploading documents... (Budget: ₹600 - ₹1500 INR, Jobs: API Integration, Chatbot Development, Laravel, MERN Stack, PHP, React.js, REST API, WordPress)