I’ve previously discussed this privately, but now at least one competitor already supports it (see this doc), so perhaps is it time?
Their version:
Chooses the phone number on their own (although they promise to support custom numbers in the future), so basically the app owner just enables a “WhatApp integration” checkbox and that’s all!
Requires an extra request for each message (similar to what CalStudio already does with images, etc.)
Solves WhatsApp File/Image Sharing Integration (they state “If your agent can do it inside your app, it can do it in WhatsApp too”)
Doesn’t reveal if and how they support a login system (which in CalStudio is required in order to solve Allow to monetize WhatsApp/Email/SMS Integration)
The competitor’s announcement:

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In Review
💡 Feature Request
5 months ago

lwc
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In Review
💡 Feature Request
5 months ago

lwc
Get notified by email when there are changes.