Changing Your Payment Method
If you want to change the payment method for your Restore subscription on your Apple device, you can follow these steps as provided by Apple's official support page:
On Your iPhone or iPad
Open the Settings app on your device.
Tap on your name.
Tap on Media & Purchases, then tap on View Account. You might be asked to sign in with your Apple ID.
Tap on Manage Payments.
Tap on Add Payment Method.
Enter the payment method details, then tap Done.
On Your Mac
Open the App Store.
Click on your name. If your name doesn't appear, click the Sign In button, sign in with your Apple ID, then click your name.
Click on Account Settings.
Next to Payment Information, click on Manage Payments. (If you're using an older version of macOS, click Edit next to Payment Type.)
Click on Add Payment.
Enter the payment method details, then click Done.
On Your Windows PC or Microsoft Surface
In the menu bar at the top of the iTunes window, tap or click Account, then tap or click View My Account.
Sign in with your Apple ID.
Tap or click the Manage Payments button next to Payment Information. (If you're using an older version of iTunes, tap or click the Edit button next to Payment Type.)
Tap or click Add Payment.
You can also add a payment method after signing in to appleid.apple.com. Please note that in some countries and regions, when you edit payment information online, additional payment methods might be removed from your account automatically.
Remember, the payment method you add will be used for all Apple services, including your Restore subscription. Please ensure that the payment method you choose is one that you'd like to use across all Apple services.