Make an in-app purchase via iOS 7.1, and you'll now be warned that the buying spree can continue for another 15 minutes without need of your password.
After you type your password to confirm an in-app purchase, the following message pops up:
"In-App Purchase Complete You can now make additional purchases in any app for the next 15 minutes without reentering your password. To change this, tap Settings and go to Restrictions."
Tap OK, and the message goes away. If you want to restrict this behavior, tap Settings and launch the Restrictions screen. From there, you … Read more