How can I use my apple gift card balance to buy diamonds in ML?
Hi there Eyaaaaaaaaaaa,
Thanks for using Apple Support Communities. It sounds like you want to make an in app purchase using an Apple gift card. You need to redeem your Apple gift card to be able to use it for purchases. Learn how here: Redeem your Apple Gift Card.
After your gift card is redeemed, learn what you can use your Apple ID balance for here: What you can buy with your Apple ID balance.
We hope this helps!