whatsmeow is a Go library for the WhatsApp web multidevice API.
The basics already work (sending and receiving messages), but lots of methods and events still need to be added. Documentation will be added later.
This was initially forked from go-whatsapp (MIT license), but large parts of the code have been rewritten for multidevice support. Parts of the code are ported from WhatsappWeb4j and Baileys (also MIT license).
The godoc includes docs for all methods and event types. There's also a simple example at the top.
Also see mdtest for a CLI tool you can easily try out whatsmeow with.
Matrix room: #whatsmeow:maunium.net