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Please, be aware that you need to create a chat channel and continue with Chats API if only you develop your own integration with a messenger.

What you will be able to do in this section

Understand how to register a chat channel
Connect the chat channel to the account
Create a new chat before sending the first message. It can be helpful if a lead with the contact exists, and creating an incoming lead isn't needed. If you want to add new leads via your chat service, there is no need for creating a chat beforehand.
Link chat to contact
Send/import/edit messages

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Please be aware that you won't be able to execute all the steps described above directly in the API Reference section due to tool limitations: it is not possible to calculate required headers and send a request simultaneously.

Example of data from Steps 1 - 5

This scheme illustrates where different IDs originate from.