Page History
...
Most REST service providers publish documentation, either with an XSD Schema set (just like you use in a SOAP call) or more free-format documentation. They usually include one or more example request and response messages, from which you can (should be able to) derive a Domain schema. In your REST service, you can choose between an XSD Schema set or a Domain schema. The first option with an XSD is for services that accept and send XML messages, and that is similar to calling a SOAP service. If a different format such as JSON is required (like in this visual), you should use a Domain schema.
Once you have the required domain model, all you need is an exposed flowan exposed Flow element that contains a page for the user input and the result, and a service call of type a Service call type: AQ_WebServiceClientRestServiceClient.
This visual shows a simple Blueriq model, without data mapping. If you want, have a look at the other visual SOAP call with data mapping, about modeling a web service call from a (more realistic) project with separate implementation modules for the business model and the web service model. The data mapping part of that visual applies to both SOAP and REST calls.