Your subscription or purchase will be restored automatically. However, you need to remember the email ID that you used to download the  Torrent pro App from the Play Store on your previous device. That email ID will be linked to the purchases you have made.
So, on your new device, you should use the same email ID for downloading the app from the Play Store. Then, your subscription or purchase will be restored automatically without any additional procedure. This will happen automatically.
Be sure to select the correct email ID in the Play Store before starting the download. If you download the app with a different email ID in the Play Store, then uninstall the app and re-download it using the correct email ID.
This way, all your purchases will be restored.