Quality grade parameter as the "finished URL" variable
We pass the participant's results quality as a parameter _re_quality_grade added to the finished URL in your study (if you are using the external tool option).
As mentioned, it's being attached to finishedUrl, if your finished URL is:
then after the test participants will be redirected to
In case you'll pass your own parameters as well (i.e. participant Id and name), then the result link will be: