For accurate measurement, this parameter is necessary. This way we can make sure that we are not presenting the survey to the same user more than once within defined time period. This parameter is not necessary if you have a content website without logged-in users.
I would prefer not to use my user’s email accounts – may I use my own primary key?
Yes, you can. We do recommend using your client’s email address, because this way you can apply automation based on their feedback straight through FanExam. Please do note that this parameter is not case sensitive.
If you use the email of one of your clients, be aware that you must have consent from your clients to collect and work with their personal data in this way.