I have an iPhone. So when I buy apple card what I do next? I'm searching all day and can't find solution
You have to go into iTunes/AppStore and at the bottom of app itself should be the option to "Redeem." Once you click that you can enter in all the information from the gift card and it will be loaded to your account. Once you purchase something it just gets subtracted from that.
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If you are an Apple use just use cash to buy an iTunes card. Google Play has something similar too.
It was given to me as a gift
You have to go into iTunes/AppStore and at the bottom of app itself should be the option to "Redeem." Once you click that you can enter in all the information from the gift card and it will be loaded to your account. Once you purchase something it just gets subtracted from that.