Here at Ocous, we don’t process payments for in-app purchases, or have access to any of your credit card information. That’s because the payment transactions themselves are completed through Microsoft's Windows Store, Apple’s App Store or Google Play (depending on your device) via your personal email address associated with that account.
That's why if you are not able to make in-app purchase, for example, your credit or debit cards are not accepted, the easier and fastest way is to contact the Store support. They have access to look into your account and solve the issue for you.
For Microsoft (Windows or Windows Phone) devices:
Visit Microsoft Support and select 'Account and Billing' link, then 'Windows, Office, and other Microsoft apps & subscriptions', and choose the option that fits you best.
For Apple (iOS) devices:
Visit Apple support and select the 'Contact iTunes store support' link, then 'Purchases, billing and redemption' and choose the option that fits you best.
For Google (Android) devices:
Visit Google support and perform a search, or use the ‘Contact us’ button on the page (English language site only) to reach a Google customer support representative by email or by phone.