I can't pay with my iTunes gift card?

I have moony on my iTunes but whenever I want to buy something it asks for my billing info (credit/debit) Plus I constantly need to keep signing in. I just got an iPhone and entered my apple ID, BTW if that matters.

Doesn't matter, you need a valid credit/debit card to do this.

You will need a valid credit card or debit card to purchase and iTunes gift card or other contents from the iTunes Store.

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