curl --request POST \
  --url https://your-instance.example.com/api/contact/message-seen \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "conversationId": "64f0a1b2c3d4e5f6a7b8c9e0"
}
'

{
  "message": "Conversation deleted"
}