How to use this iTunes card

Redeem App Store & iTunes Gift Cards, Apple Music Gift Cards, and content codes - https://support.apple.com/HT201209

https://support.apple.com/en-us/HT201209

It's not clear if you're having a problem seeing the numbers. If you are:

If you can‘t redeem your iTunes or Apple Music Gift Card or content code - http://support.apple.com/HT201195

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