api.xep.com is a cloud-based XSL-FO formatter. You can programmatically send your XML sources to this web service and receive the formatted PDF documents. The service formats standalone XSL-FO documents as well as XML documents with accompanying XSLT stylesheets and images.
The documentation is a good place to start exploring how to use the service. You can quickly create clients based on provided examples for various programming languages. Let us know if you have questions or difficulties while integrating the service into your system. We will be happy to help you.