Hi @dvbridges, thanks for your reply. In the documentation, I find how to have psychopy read info from URLs and to write static information into URLs.
I’m looking for something a bit different: I want to have psychopy write dynamic info, such as the participant id into the completionURL.
Specifically, I want to redirect participants to Qualtrics after completing the experiment and have psychopy write the variable participant (unique for each ppt) into the completionURL, to have Qualtrics read it.