Creates a conversation

You can create a conversation that has been initiated by a contact (ie. user or lead).
The conversation can be an in-app message only.

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Sending for visitors

You can also send a message from a visitor by specifying their user_id or id value in the from field, along with a type field value of contact.
This visitor will be automatically converted to a contact with a lead role once the conversation is created.

This will return the Message model that has been created.