If you made a purchase on KIXEYE.COM that failed to be applied in-game, you will need to reach out to Xsolla support, as they are in charge of our payment system. Here is a link to their support page: https://support.xsolla.com/
If you are wondering why we cannot assist with this payment issue since it's our game, keep in mind that payment systems are often built-in third-party tech based on the platform you are playing on. If you were playing our game on iOS, you would need to speak to Apple Support about their payment system. For Android, you would need to speak to Google Play Support, and similarly, if you were having trouble purchasing through PayPal, we would recommend you reach out to PayPal.