I cannot see my gift card balance

Re: "I cannot see my gift card balance"

You may need to restart your iPhone in order to see the recent update:

Restart your iPhone - Apple Support

Else:

Wondering what kind of Gift Card you have:

See: What type of gift card do I have? - Apple Support

Gift Cards generally need to be "redeemed" in order to use them.

How to redeem your Apple Gift Card or App Store & iTunes gift card - Apple Support

How to: Check your gift card balance - Apple Support

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Trouble-shooting if needed:

Check whether Gift Cards can be used as a payment method in your country or region

Payment methods that you can use with your Apple ID - Apple Support

or what to do:

If you can't redeem your Apple Gift Card or App Store & iTunes Gift Card - Apple Support