Is your credit account empty? No problem, you can purchase and immediately receive credits at any time.
You can also purchase credits using prepaid cards: all common App Stores also offer the option of adding desired credit to an account of the corresponding store with prepaid cards. In turn, purchases in the app can be effected using this credit. You can obtain the necessary prepaid cards in different shops of the retail section (e.g. REWE, Lidl, Müller, etc. ).