This is a brief guide if you are keen to learn how to test your WSDL endpoint using SOAP UI.

To start off with, what is WSDL?

What is WSDL?

WSDL is a "Web Service Definition Language" is an XML language for describing Web services. Specifically, it is defined by the industry body W3 - World Wide Web Consortium (W3C) organisation as the following:

Web Service Definition Language (WSDL) is an XML format for describing network services as a set of endpoints operating on messages containing either document-oriented or procedure-oriented information. The operations and messages are described abstractly, and then bound to a concrete network protocol and message format to define an endpoint.

W3.org
Source: https://www.w3.org/TR/wsdl.html#_wsdl

This guide details the steps to help you to change your plan on Cloudflare using the Cloudflare API. You can always change your plan within the user interface of the Cloudflare portal, however, you may be looking to change your plans in bulk and that is where using the Cloudflare API makes more sense.

For the purposes of Cloudflare settings, a "zone" or "domain zone" is Cloudflare's naming convention for a "website" URL address.