How can I use my gift card to perches gems in clash Royale

Hello jovani133,

Welcome to Apple Support Communities. We understand that you want to make an in-app purchase with your gift card. We are happy to help.

Were you able to follow the steps in the support article that brought you to us? You will make the in-app purchase and it will use the the money from the gift card first and then charge your credit card or debit card if there isn’t enough available for the purchase. We recommend reviewing the information here about making in-app purchases: Buy additional app features with in-app purchases and subscriptions - Apple Support

Let us know if you have additional questions.

Take care.