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I didn't see anything about an API – did anyone else see it? That would be a killer feature. Being able to build WhatsApp bots just like in Telegram.

This says no for now.

How does api play with e2e encryption?

The API would be granted access by one of the parties.

So if the business runs the API, they’d use the business’s keys to read messages.

You wouldn’t need WhatsApp to have access even then.

'Mark as read'

Add this action to notifications on Android. Then, I'll consider a business a/c.

Why should I trust it?

WhatsApp Business App