Please follow the steps below if the order is placed on App Store:
Step 1 Open the Settings app on your iPhone/iPad/iPod.
Step 2 Tap your name, then tap iTunes & App Store.
Step 3 Tap your Apple ID (which is usually your email address), then tap View Apple ID. You might be asked to sign in.
Step 4 Tap Manage Payments. (If you're using an older version of iOS, tap Payment Information.) Then add, update, reorder, or remove your payment methods.
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