There may not be a foolproof way where the user is authenticated in Typeform to be a specific User, but you could easily just have an email field that the user puts in and then match it to your database. Errors could occur if someone uses someone else’s email or has a typo though

Or you could use a URL Parameter to pass the information into typeform, saving the user from typing it in and helping stop any errors https://help.typeform.com/hc/en-us/articles/360029114712-How-to-use-Hidden-Fields

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