I redeemed my $100 giftcard and when I tried spending it on mobile legends for diamonds, it did not process and said "your purchase could not be completed"
Thanks for participating in Apple Support Communities. We understand that after redeeming an Apple Gift Card you were unable to complete an in-app purchase. First, check your Apple ID balance to ensure you show an available balance: Check your Apple ID balance
If you show an available balance, take a look at the section "Learn more" for some helpful steps: Buy additional app features with in-app purchases and subscriptions
Thanks again, and take care.