How to use apple gift card
How will i use my apple gift card to purchase games
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Juvilen: It depends upon the kind of card you have. Read this link: What type of gift card do I have? [Apple gift card differences] - "Apple offers two different types of gift cards: Apple Store Gift Cards and App Store & iTunes Gift Cards. You might also have a different, older card." - https://support.apple.com/HT204199
If you have an App & iTunes Store gift card you redeem it to put balance in your account which will be used to pay for the item automatically.
Redeem your App Store & iTunes Gift Card - https://support.apple.com/HT201209