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We recommend starting with SoapUI examples - getting them working before you attempt your own implementation. Using SoapUI is very easy:
just install the multiplatform standalone application SoapUI  import demo project ws-demo-soapui-project.xml into SoapUI and submit prepared request messages.
The demo project contains DataDelivery and LTA examples preconfigured with #Demo account thus the location is limited to demo region (10x10km)
The REST access examples work out of the box, all that is needed is to just run the requests by clicking on the "Submit" button and you should see successful results of the call. Here is DataDelivery REST access example:

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click here for request and response examples

DataDelivery Web Service

click here for request and response examples

Implementing client for Web services

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