The Paymentsite Universal API is a server-side application (Web service) that provides access to transaction processing services. All communications take place over secure HTTPS links on the Internet. Requests are sent to the payment processing servers by "POSTing" XML or JSON data that has been formatted per the schema defined in this specification. The response is returned as XML or JSON data in the body of the HTTP reply.
The XML can be posted using any of several different web languages, including: