Managing auto-renewing subscriptions -
If you want to cancel a subscription from Apple - Apple Support
You usually need a payment method -
You usually need to have added a valid payment method to your account. Even to re-download or update apps and for free apps. You can find the acceptable payment methods for your country here;
Payment methods that you can use with your Apple ID - Apple Support
If you only have one payment method on your account, you can't remove it unless you supply a 2nd functioning payment method first.
M1 Mac mini, macOS 14.2; Watch, series 7 GPS/cellular, watchOS 10.2; iPad Pro 2nd Gen, iPadOS 16.7.3; iPhone 12 Pro, iOS 17.2; TV 4th Gen, tvOS 17.2; HomePods, audioOS 17.2 and Airport Express w/ Airplay 2