Facebook is introducing subscription billing for apps in a move that should boost the revenues of game and app developers, as well as adding to its own coffers via a 30% cut.

From July, developers will be able to implement subscription plans, offering updated content and a premium experience for their most loyal, fee paying users, establishing a recurring revenue stream on top of the already existing one-time payments.

The least developers can charge for a monthly subscription will be $1.

“This new feature will be available to all Facebook.com and mobile web apps in July,” said the company in a blog. “In the meantime, you can get started by reviewing our documentation and signing up for more details. Subscriptions are already being tested by developers such as KIXEYE and Zynga.”

Facebook is also moving away from its virtual currency Facebook Credits, introduced in 2009; meaning subscriptions and in-app purchases will now be carried out in the user’s local currency.

“By supporting pricing in local currency, we hope to simplify the purchase experience, give you more flexibility, and make it easier to reach a global audience of Facebook users who want a way to pay for your apps and games in their local currency,” said Facebook.

“With local pricing, you will be able to set more granular and consistent prices for non-US users and price the same item differently on a market-by-market basis.”