Pass back user Information

I am using SSI Web for my whole survey (not linking to another survey during the questionnaire) - for an Adaptive-Conjoint-Analysis.

I am working with a company which provides people answering my questionnaire.
They sent me three links I have to integrate to the Terminate/Link question that the respondents will come back to the company's homepage.
The company send me, when the respondent opens my survey, a code or a user ID (they integrate it in the link I will send them for my study). They told me to put a "pass-in"field just in the beginning of the survey (I think I know where I find this field) and put in this pass-in field a variable which takes or save the code (they send me with the respondent) in the beginning of the survey and send back this code to them that they can check which respondent answer or rather not answer the survey.

My question now ist what do I have to do or rather to put into the "pass-in" field that it takes this code sending from the company?
I don't want to integrate passwords or s.th. like that. Does it work without because they generate the specific IDs?

Really needs your help and would be thankful for any suggestions to solve my problem!

Paula

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