Carrying participant IDs from Pavlovia to Qualtrics using the URL

Online experiments
1

Hi

I am having an issue sending the PROLIFIC_PID value from pavlovia to qualtrics in my experiment. I have visited the other forum posts and tried to do some of the recommended things in this document Thomas Pronk / demo_chaining · GitLab

My experiment looks like this:

when redirected from prolific this is the link and as you can see the PROLIFIC ID is assigned and carried forward, when I check the datasheet too the PROLIFIC ID is there.

Screenshot 2021-08-23 at 11.20.01
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But then when the pavlovia phase is completed and the participants are redirected to qualtrics, the ID gets lost as you can see here.

Screenshot 2021-08-23 at 11.21.41
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This is the Completed URL that i have put in my experiment settings:
http://ucdpsychology.qualtrics.com/jfe/form/SV_83ajpLB3BTm8E1U?"PROLIFIC_PID=" + expInfo[‘PROLIFIC_PID’]

with a PROLIFIC_PID in the expinfo section of the experiment

I have attached my Psyexp file for referenceBTT5-qualtrics.psyexp (144.5 KB)

with regards to qualtrics:
I have set up an embedded data variable here

Screenshot 2021-08-23 at 11.49.58
Screenshot 2021-08-23 at 11.49.581816×256 26.7 KB

and also a textbox to display the prolific ID

Screenshot 2021-08-23 at 11.50.13
Screenshot 2021-08-23 at 11.50.131332×192 10.3 KB

but since the PROLIFIC_ID is not being passed, its showing up empty.

I’m not sure how to pass the ID from Pavlovia to Qualtrics using the URL

2

Your completed URL should be

$"http://ucdpsychology.qualtrics.com/jfe/form/SV_83ajpLB3BTm8E1U?PROLIFIC_PID="+expInfo['PROLIFIC_PID']
3

Thank you so much for this!!