More than 25 shopping cart and e-commerce service providers now include Amazon Payments as part of their offering. This makes it is easy for Web sites to begin offering Amazon Payments within the framework of the e-commerce solution already provided to them by these companies.

Nonprofit software provider Convio is integrating Amazon Payments into its fundraising platform to enable its client base to accept alternate payment methods for online donations. In addition, plug-ins for widely-used open source e-commerce platforms, such as OsCommerce and ZenCart, are now available for quick and easy integration with Amazon Payments.

“Working with shopping cart and e-commerce solution providers to make sure their solutions seamlessly integrate with Amazon Payments was one of our immediate priorities when we launched Amazon Payments less than a year ago,” said Mark Stabingas, GM of Amazon Payments, in a statement.

The free processing offer runs through September 30.