Yes, you can. We use Shopify billing, You can just remove the app.
Please make sure that you cancel it before your trial ends if you are on trial. If you already passed the trial, You will still be charged for that cycle even if you uninstall
First, you can email us at email@example.com, and then you can uninstall the app from Shopify. Go to your apps. Find the OJMD App and then Uninstall or delete
Please take note that Vibranium might delete its products once you remove it. We have and reserve the right to do that.