Hey @ yibs,
You can download SoapUI 5.4 from http://www.soapui.org
Each step in the Working with Visa APIs guide outlines what it takes to get your project off the ground. From finding a use case that meets your needs, to launching that project to your customers. Please follow the Working with Visa APIs guide to create a project and for sandbox testing here - https://developer.visa.com/pages/working-with-visa-apis
After you've registered on the VDP portal and created a project you should click on the Authentication > Two-Way SSL link here - https://developer.visa.com/pages/working-with-visa-apis/two-way-ssl
Please follow the Two-Way SSL guide step by step and in sequence to have it successfully work.
You'll need to use the Visa Direct project app Test Data (refer to screenshot below).
You can also use our Visa Direct Code Explorer to see a sample request and response payload here (refer to screenshot below) - https://developer.visa.com/capabilities/visa_direct/reference
Please let us know if you have other questions and someone will be happy to help!
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