Since Apple and Google handle all subscriptions, they don't let any app-developer handle any payment within the apps, you'll have to cancel any subscription you have with them directly.
If you are on iOS, please follow Apple's official guide here:
https://support.apple.com/en-us/HT202039
If you are using Android, please follow Google's official guide here:
https://support.google.com/payments/answer/6220303?hl=en
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