How do I data drive a REST Api endpoint?

Create a REST Project from URI,

Add your URI,

https://XYZapi.com:1234/api/athing/

Once you do that add a RESOURCE level parameter of type TEMPLATE,

http://www.soapui.org/rest-testing/understanding-rest-parameters.html

Once you do that in the parameter.

Add the request to a TESTCASE and create a datadriven test

http://www.soapui.org/data-driven-tests/functional-tests.html

Thanks,
Jeshtha