curl --request POST \
  --url https://api.g-tateth.com/api/widget/messages \
  --header 'Content-Type: application/json' \
  --data '
{
  "conversationId": "<string>",
  "text": "<string>",
  "attachments": [
    {}
  ]
}
'

{
  "success": true,
  "data": {
    "messageId": "<string>"
  }
}