We regret to inform you that this article has lost its relevance. Perhaps, the described service is no longer available, or the API working conditions have changed.
Now the Chat API offers the most accessible and automated messengers Business API on the market with Shared Team Inbox, No-Code Chatbot Builder, ready-to-use apps integrations and other features.
This is a reliable way to introduce more than 2 billion messenger audience to your business or product: customer engagement on messengers made simple.
The actual documentation is located here
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