Example: curl https://api.signable.co.uk/v1/users/1000 -u d41d8cd98f00b204e9800998ecf8427e:x
(refer: https://developer.signable.co.uk/v1/user/)
How to test the endpoint using SoapUI 5.6.0? Or If someone can share how to test it in Apex/Salesforce, that would be helpful.