I just bought an iTunes gift card and I insert the code into my iTunes account. It worked but now, I tried to buy some things on Pocket Legends and it doesn't work. It keep saying that I need a credit card or something. I just want to pay with the gift card code I just put on my account (it was 15$) but it don't let me.

Can anyone fix it or help me please ? I really wanna level up again because I can't use a credit card.

Thanks.