With the help of Google Play, you can play for purchases in-app through your mobile service provider. In doing so, your account with your mobile provider will be charged within 15 minutes of a purchase.
In Russia the following providers offer this service: Beeline and Megafone. You can find out about service providers in other countries here: https://support.google.com/googleplay/answer/2651410?hl=en

To complete a payment in our app through your mobile service provider, you must:

1. Open Topface
2. Login to your profile. Check to make sure that you're logged into the correct profile (if you have more than one) that you want to use for this payment service.
3. Choose a Topface product that interests you.
4. Choose Google Play on the payment screen.
5. Choose the product that you want to buy.
6. A Google Play payment window will open.
7. To add/change your payment method, you need to tap the arrow symbol right next to the price.
8. Choose "Payment Methods"
9. In the section "Other Methods" choose "My (Name of Mobile Provider) Account"
10. In the window "Pay via (Name of Mobile Provider)" enter in your payment details. All fields must be completed to make this type of payment. In the future, you won't have to fill in these fields again.
11. Confirm your data.
12. After saving your data, in the Google Play window will now be a payment option "My (Name of Mobile Provider) Account".
13. Confirm your payment. To complete it, enter in the password for your Google account.
14. In 15 minutes your payment will be complete.