Google has integrated its Chrome Web Store with its Checkout online payment system, as it gets ready to open the application marketplace to end users later this year. The Chrome Web Store, available in preview mode to developers since May, is intended as a central online repository where people can find and buy a variety of web applications.

Now developers can set up a Checkout account so that they can charge for their applications using the store's built-in payment system. For now, this is limited to developers in the US who have a US bank account, Google said. Google also gives developers the option of using other payment systems.

The store's payment system lets developers offer various options, including charging a one time fee, billing on a monthly or annual subscription basis and offering a temporary free trial. Applications can also be entirely distributed for free.

Google also announced new capabilities for developers to preview and customise their applications' landing pages, adding the ability to add a custom header image, as well as a larger icon.

Although it carries the name of Google's browser, the Chrome Web Store is designed to work with other browsers as well. Google plans to open the store to end users before the end of the year.