Google+ Game Checkout

With Google Checkout, you can pay for virtual goods without leaving your Zynga game. You must have Gmail and Google + social network accounts to utilize Google's Checkout feature to purchase points. 

Availability 

Buyers in more than 140 countries can sign up for a Google Checkout account. To see if Google Checkout is currently supported in your country, please check theLocation drop-down menu on the sign up page at https://checkout.google.com. 
 

Acceptable forms of payment

Google Checkout accepts credit, debit, or gift cards with the following logos:

• American Express (accepted only in the U.S.)
• Discover (accepted only in the U.S.)
• MasterCard
• Visa
• Visa Electron (accepted outside of the U.S.)

Costs and Fees

Google Checkout is a free service, so you’ll pay only for the price of your good and any applicable taxes. There aren’t any additional charges or fees for making payments through Google Checkout.

more about it you can find on: All Zynga Games News blog