Hi @Eumetis,
You can try to upload the database in a XM Directory keeping Email and ExtDataRef as a Dedup feild.
Post this you can use an authenticator in the survey for authenticating the data with the contact list and then can pull the related information.
Regarding the supplemental data, please check with your Account executive or reach out to Qualtrics support for this.
Hi @Eumetis, I agree with @Sowrabh1993 ‘s answer but just wanted to let you know that if you are using transaction data for the import and distribution of the survey, using an authenticator becomes a bit of a problem. There is a work around but if you are only using embedded data from the start, then that’s all fine :)
Thanks
Rod Pestell