By Gautham Nagesh and Rolfe Winkler 

Google Inc. has agreed to settle a Federal Trade Commission complaint that it allowed children to rack up millions of dollars in charges in its mobile app store without their parents' knowledge or consent.

As part of the settlement, Google will refund a minimum of $19 million to consumers whose children made purchases inside applications downloaded from the Google Play app store. Google will also modify its billing practices to ensure it obtains express consent before charging consumers for items sold in mobile apps.

"As more Americans embrace mobile technology, it's vital to remind companies that time-tested consumer protections still apply, including that consumers should not be charged for purchases they did not authorize," FTC Chairwoman Edith Ramirez said.

Many mobile apps and games sold in the Google Play store encourage users, including children, to accumulate virtual items that help them advance in the game. The FTC's complaint alleges that when Google first launched its app store in 2011, it billed consumers for these "in-app" purchases without first obtaining authorization from the account holder.

The area is of growing importance to the search giant. In-app purchases on Google Play are now the second largest business for the search giant, after advertising, according to people familiar with the company's financial results. Credit Suisse estimates that Google Play revenue will double in 2014 to $4.4 billion.

"We've already made these product changes to ensure people have the best Google Play experience possible, a Google spokeswoman said. "We're glad to put this matter behind us so we can focus on creating more ways for people to enjoy all the entertainment they love."

Write to Gautham Nagesh at gautham.nagesh@wsj.com and Rolfe Winkler at rolfe.winkler@wsj.com

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