How come I don't need to provide any payment information when I donate?

When you click the "give" button, the app will record that as a pledge rather than a charge. Instead of charging you every time you donate, we'll add each of your donations to your account's balance. Your balance reflects the aggregated dollar amount you have pledged and not paid. You can access your balance from the Balance under the menu. Periodically, we'll take your unpaid balance and ask you to approve a credit card transaction for that amount. A pledge becomes a donation once you make make payment with your Google account. Please note that your balance will also include the amount which you offered to match, even if it has not been claimed yet.