Following the recent introduction of in-app purchasing for apps on its Appstore for Android, Amazon has removed the US$20 restriction for the value of purchases that can be made, reports TechCrunch.

Amazon emailed developers saying that due to an update to parental controls in the Appstore it is now allowing in-app purchase values above the initial limit and will accept apps that allow this via its developer portal.

This move should be welcomed by developers, especially as only a small proportion of app users make payments within apps and games. Apps analytics firm Flurry recently found that in-app transactions over the value of US$20 make up the majority of revenue for the top-grossing games on both Android and iOS.

The strengthening of parental controls reduces the likelihood of children being able to access apps in which they could spend excessive amounts of money. Despite having Amazon’s one-click payment model, that company’s Kindle Fire tablet can be set up so that a four-digit PIN has to be entered before a purchase can be made.

Another recent Flurry report found that Amazon’s Appstore for Android delivers three times the amount of revenue for developers as the Google Play app store.