At etermax we do not process payments for integrated purchases nor do we have access to your credit card information. This is because payment transactions are executed through the Apple App Store or Google Play Store (this will depend on your device's operating system) and use the email address associated with that account.
Apple or Google will email receipts for these transactions once the purchase has been completed.
In the event of a problem with one of your purchases, we invite you to visit the following article: What do I do if I had a problem with a purchase?