In app purchase
I bought energy in an app but it didn't go though but took my money and I just wasted my money I told them about it and they said by To get the confirmation of the my payment from apple can u help
See your purchase history in the iTunes Store on a Mac or PC - http://support.apple.com/HT204088 - Does not include purchases made by others under Family Sharing; those have to be checked from their accounts.
You should also have received an email receipt for the purchase plus you will eventually see it on your credit card if one was used to pay for it.