thephpleague/omnipay-paymentexpress — pull request #10 by steveh (2014-11-19 00:57:56+00:00)
Title: Add support for Payment Express PxFusion

https://www.paymentexpress.com/Technical_Resources/Ecommerce_NonHosted/PxFusion

Very similar to eWay RAPID 3.0 - generate a form on your site which POSTs to Payment Express.

There is also an authorize/capture mechanism, but that requires access to a different API I don't have access to.