Macaroni wrote: However I am having trouble finding out how to let participants fill in their own token.
If the survey is with closed access, you can :
1.) Provide a link with the token
Participants can enter the survey without entering the token.
It's done automatically.
What format of URL link is accepted depends on the webserver settings.
E.g myserver.tld/853399/token/PXMEK9OzMrqlHry/
URL: yourdomain.tld/SID_of_your_survey/token/PERSONALCODE
2.) Provide a generic link and the token.
If participants visit link they are asked to enter their token.
Like Tony already posted.