Purchase failed

I was trying to purchase money with iTunes card but it failed.

Do you mean you want to redeem an your Apple Gift Card or App Store & iTunes gift card?

If so, see -> How to redeem your Apple Gift Card or App Store & iTunes gift card

How to redeem your Apple Gift Card or App Store & iTunes gift card – Apple Support (UK)

When redeeming a gift card, (1) the amount will be credited to your Apple ID balance and (2) then you need to set your Apple ID balance as your default payment.

(1) See -> Check your Apple ID balance

Check your Apple ID balance – Apple Support (UK)

(2) See -> Add a payment method to your Apple ID

Add a payment method to your Apple ID – Apple Support (UK)

If you update your payment method or add funds to your Apple ID balance, It would take about 1 to 3 business days in order to process.

If you're still unable to update your payment method, Contact Apple Support.

See also -> App Store & iTunes gift card: Apple Gift Card - Apple (UK)

• Add money to your Apple Account balance anytime, no gift card needed.