Of course this is just a help article for the good order, but okay here is how to Cancel your Bkper Subscription.
Cancel Bkper Subscription
Go to the Billing Page in your profile image on the top right corner
Press the Cancel Subscription button and confirm the cancelation.
Cancel Subscription on GCP
If you have subscribed to a paid plan through Google Cloud Platform, go to https://console.cloud.google.com/marketplace/details/bkper-public/bkper.
Select your project in the top left corner through which you are billed for Bkper.
Scroll down to the Features and pricing grid and click Change in the Bkper Free tier to unsubscribe.