conversation_message_create

{
    "content": "string",
    "message_type": "outgoing",
    "private": true,
    "content_type": "text",
    "content_attributes": {},
    "template_params": {
        "name": "sample_issue_resolution",
        "category": "UTILITY",
        "language": "en_US",
        "processed_params": {
            "1": "Chatwoot"
        }
    }
}