How can I pay for my iCloud
How can I pay for my iCloud
iPhone XS, iOS 15
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iCloud automatically uses your Apple IDs payment method. Just follow the steps in the support document you posted from to add a payment method to your account and iCloud will use it.
If you use a different iCloud account to the one you use for iTunes & App Stores, then you will need to access the account you use for iCloud to add a payment method for it.