As seen in the specs you just have to load the vendors script and that gives you a callback to retrieve the custom data. The fields in that array of objects is up to the marketer and the example represents the default data set you get. So first you will have to discuss the fields or at least make sure the client want to work with the default fields. Then you will have to discuss what you want to do with the data and how to display it.
There are plenty of examples how to use dynamic data to replace the innerHTML of some rectangle you place on stage in the forum. The easiest way I find is using a class name and the replacing all the occurrences in a scene.
One older approach (but easy to use is this one):