https://levelup.gitconnected.com/how-to-send-whatsapp-messages-with-laravel-ed6426b4be96

tutorial
https://medium.com/@snomanali1996/whatsapp-integration-with-laravel-using-twilio-api-9bd8ecd06dbf#id_token=eyJhbGciOiJSUzI1NiIsImtpZCI6ImEzYjc2MmY4NzFjZGIzYmFlMDA0NGM2NDk2MjJmYzEzOTZlZGEzZTMiLCJ0eXAiOiJKV1QifQ.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.KKOALFgLe1bPDydIwVMMKxm13eUptiYbadyytOc0bV2bdahDDsc-LUROZR3mIYvbheUcYChJNWkgK7ulHWnp4H36-FdNhKMrLuGIqU79jwEUwgJITYW9s7HJ6OxrTY5ieFJ3b8ituoAOHz8cSxmLOJt_XnnHpTSan_JUXe61In7nz72fX6dMBBv90KzNSZuTge2NqN3kply8qAFO7cDgxcMd11uy0-fVPBXNXIZGdj9wJhL2E0DOv9VjYcj1NHZov906NpyOB4c7siz0SaQHyD2IFUEi5Z5RGoEcsAqU7uhxylKv82rELgr7LHCSuuubtp-7a7eMMIfgJQDNrYoO9A


twilio - vonage
https://www.twilio.com/blog/create-laravel-php-notification-channel-whatsapp-twilio

ufficial 
https://developers.facebook.com/docs/whatsapp/cloud-api/get-started