I think managed to write it this morning while building a Harry Potter Lego game.
https://moryscarter.com/vespr/pavlovia.php?folder=Wake&experiment=prospective-memory-ldt
It will take four parameters.
folder and experiment are required
id is an optional identifier so you can connect the data back to Qualtrics or whatever. The expectation is that this would be random.
researcher is an identifier I am using as a password
You should then be able to assign to conditions using a modulus of participant which is assigned by my web page.
The id is not stored on my web page. I am currently storing folder, experiment and current time. I could drop current time if that was felt to be too intrusive.
Cheers,
Wakefield