Trying to add a credit card
How do I add my credit card
iPhone 8, iOS 13
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This document explains how to add a payment method to your Apple ID on a Mac, Apple mobile devices, PC, or online. Click here --> Add a payment method to your Apple ID - Apple Support
On an iPhone:
Open the Settings app.
Tap your name.
Tap Media & Purchases, then tap View Account. You might be asked to sign in with your Apple ID.
Tap Manage Payments.
I presume all is proceeding well since you have not mentioned a problem. ;-)