curl --request POST \
  --url https://api.social-api.ai/v1/inbox/conversations/{id}/messages \
  --header 'Authorization: <api-key>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "account_id": "acc_abc123",
  "attachment_url": "https://cdn.example.com/photo.jpg",
  "attachments": [
    {
      "source": "550e8400-e29b-41d4-a716-446655440000",
      "source_type": "media_id",
      "type": "image"
    }
  ],
  "buttons": [
    {
      "payload": "VIEW_ORDER",
      "title": "View order",
      "type": "url",
      "url": "https://shop.example.com/orders/1"
    }
  ],
  "cards": [
    {
      "buttons": [
        {
          "payload": "VIEW_ORDER",
          "title": "View order",
          "type": "url",
          "url": "https://shop.example.com/orders/1"
        }
      ],
      "image_url": "https://cdn.example.com/p.jpg",
      "subtitle": "Short description",
      "title": "Product name"
    }
  ],
  "message_tag": "HUMAN_AGENT",
  "quick_replies": [
    {
      "payload": "TRACK_ORDER",
      "title": "Track my order"
    }
  ],
  "reply_to_message_id": "m_1234567890",
  "text": "Thanks for your message!"
}
'

{
  "message_id": "m_1234567890",
  "message_ids": [
    "m_1234567890"
  ],
  "success": true
}