selfhost your whin instance, a Whatsapp API REST client.

Mywhin is a REST API-based WhatsApp client that allows programmatic access to WhatsApp functionality.
Compared to the Meta API, Mywhin provides more freedom for sending messages to groups and individuals, and users can keep their phone numbers.

This API is a dedicated version of whin, you can learn more about it here: https://rapidapi.com/inutil-inutil-default/api/whin2/details

All the actions implemented on mywhin are performed through a set of simple HTTP requests, enable users to automate group management, sending and receiving messages on whatsapp, to automate and gain efficiency.