Whatsapp Business API-Consultancy-Integration "For India"

Dear Freelancers. I am looking to integrated whatsapp api. I have rough idea of procedure. I am looking for someone who has done it throughly. I am looking to integrate it for INDIA. Candidate should know all the aspect of whatsapp api integration and formalities that need to be done with authority to take approval and all other things that come in way. Looking for the end to consultancy and development(if required) to completed. Only candidate with the similar experience can apply. No time for try and error method.