The standard way to buy content from the Play Store is to key in a credit or debit card number, but there are many alternative approaches to choose from. You can buy credit online, purchase a gift card from a store, have your carrier send you a bill, or connect Google Wallet to your PayPal account.

PayPal support has to roll out on a country by country basis, and now Turkey has made the list.

Residents of this country that straddles the line between Europe and the Middle East should be able to use their accounts to purchase apps, games, and books from Google Play. PayPal cannot be used to purchase devices, nor you can use it to purchase Google Play credit. That would be cheating.

Source: Google Play support