{
  "operation": "sendMessage",
  "method": "POST",
  "path": "/group_channels/{channel_url}/messages",
  "description": "Send a text message to a group channel.",
  "request": {
    "url": "https://api-YOUR_APP_ID.sendbird.com/v3/group_channels/sendbird_group_channel_12345/messages",
    "method": "POST",
    "headers": {
      "Api-Token": "{api_token}",
      "Content-Type": "application/json"
    },
    "body": {
      "message_type": "MESG",
      "user_id": "agent_001",
      "message": "Hi Jane! I'm looking into your order issue right now. Can you confirm your order number?",
      "custom_type": "support_response",
      "data": "{\"ticket_id\": \"TKT-9876\", \"priority\": \"high\"}"
    }
  },
  "response": {
    "status": 200,
    "headers": {
      "Content-Type": "application/json"
    },
    "body": {
      "message_id": 987654321,
      "type": "MESG",
      "message": "Hi Jane! I'm looking into your order issue right now. Can you confirm your order number?",
      "channel_url": "sendbird_group_channel_12345",
      "user": {
        "user_id": "agent_001",
        "nickname": "Support Agent Alex",
        "profile_url": "https://example.com/avatars/alex.png"
      },
      "created_at": 1746172900000,
      "updated_at": 1746172900000,
      "custom_type": "support_response",
      "data": "{\"ticket_id\": \"TKT-9876\", \"priority\": \"high\"}",
      "mention_type": null,
      "mentioned_users": []
    }
  }
}