Board Thread:Questions and Answers/@comment-35477790-20180731235850/@comment-33362357-20180806001746

On Android you can link your PayPal or use the Google Opinion Rewards money you get to buy SQ.

On iOS you have to buy a Japanese iTunes giftcard. Or you link a Japanese credit card to your iTunes account (you most likely had to use a Japanese iTunes account to download FGO). You can try linking American cards to your Japanese iTunes account but IDK if that'll work.