Apple processes payments made toward the game through iTunes and should be able to help you with your problem.
If you’ve made an order that has been processing for 24 hours or more, please contact iTunes Support here: https://support.apple.com/contact
You can see your purchases from the past 90 days and report a problem with them at http://reportaproblem.apple.com
You can read more about how to review your full purchase history here.
For information on accepted purchasing methods: https://support.apple.com/en-us/HT202631