Accessing SURequest / SUAjax post parameters

Hi

I am constructing  custom SURequest object -- and need to access the
post parameters during callback.
How would you accesss the testParam callback parameter values.

Ideally with something like:

renderSaveRequestOn: html

        html anchor
  onClick:  (html request
  callback: [ self updateModel: self testParamValue];
                        addParameter: 'testParam' -> 'abc');
  with: 'SURequest example'
               
What would #testParamValue need to implement?

Thanks
--

Edward Stow
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