Test if Information is being added to survey through URL Query String

Here is a survey to test if a service is in fact entering the value of a variable "userid" into Qualtrics, to be set as an "embedded data" field. This survey has been set up to display the value (if any) of "userid" that has been entered:

e.g. you can see that it's working below when I append &userid=testjjwhasheduserid