There is a problem when i'm trying to buy Coins Package

Hello,
I'm trying to buy the 750 coins package but from some reason it says that I dont have a sandbox account, i opened a test sandbox account and now i have no clue what to do ...
What do you guys suggest me to do?!

I really wanna buy this package buy I can't.

Hope to hear from you soon,
Thank you for you help,
Berco6.

if you have a jailbroken device and get this error you need to go into Cydia and delete the Appsync package, reboot your device and then reinstall Haypi

also, if you arent jail broken you should update your ios or firmware, and make sure that the information you are using as money in the app store has not been used. if it is a card that has been used on another app store account, then it will not work. if it is a credit card, make sure you only have 1 credit card assigned to your app store account. also, make sure each app store account you have has a different credit card assigned to it.