Hello community,I need help with this:I would like a customer to not be able to answer a survey more than once?I found to activate the option ‘Prevent Ballot Box Stuffing’, but I have the problem that if a person buys several times it will not let them complete the survey, if they use the same device or the same browser ... until you delete the cookies manually or automatically ... no matter how long, in days or months...In the encrypted URL of the survey will come with the voucher number (which is unique) ... but I can not think how and where to make a validation?Can you help me with this Thanks

@Aine,Yes, you’ve got it.Add a mailing list (aka contact list) where ExternalDataReference is the unique key.Add an Authenticator to the beginning of the survey flow. Use the option to automatically validate ExternalDataReference on the voucher parameter in the url. Set it to only try once. Add an End of Survey block under the Authenticator to screen out anyone that validates.Add a workflow to your survey to add the contact (voucher) to the mailing list when the survey is complete.

ahh perfect! ... just as I show youThank you! Very much

Preventing a customer from answering the same survey more than once

Preventing a customer from answering the same survey more than once | Experience Community

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