Do not actually use the provided script stubs right now. The server only expects the inner contents of a function. The data is prepresented with the variable "data". And be sure to add "return data;" at the end of the script. Any questions, please ask Tina. An example of a script you can send is this:
data.newAttribute='Added!.'; return data;
(You can definitely make it more complex than this, but this is a good start.)