Create a new conversation thread.
Note: chat_setting_id has been deprecated, now use agent_id instead, chat_settings_id is still supported for back-compatibility purposes. If no agent_id nor chat_setting_id is provided, the default agent for the company is used.
Bearer authentication header of the form Bearer <token>, where <token> is your auth token.
255ID of the agent to use. If not provided, uses the default agent for the company.
DEPRECATED: Use 'agent_id' instead. ID of the chat setting to use. If not provided, uses the default agent for the company.