curl --request POST \
  --url https://api.l2msg.com/whatsapp/chat/markChatUnread/{instance} \
  --header 'Content-Type: application/json' \
  --header 'apikey: <api-key>' \
  --data '
{
  "lastMessage": [
    {
      "remoteJid": "<string>",
      "fromMe": true,
      "id": "<string>"
    }
  ],
  "chat": "<string>"
}
'

{
  "message": "Read messages",
  "read": "success"
}