WHATSAPP API

    Explicación: 
    https://www.youtube.com/watch?v=CNCYE74K-4k

    Usando un proveedor oficial del servicio whatsapp facebook api:
    Twilio:
    https://www.youtube.com/watch?v=LhlLPLC4tPY

    Whatsapp home api
    https://www.whatsapp.com/business/api?lang=es

    Empresas que proveen el servicio:
    https://www.facebook.com/business/partner-directory/search?platforms=whatsapp&solution_type=messaging