Within the order process you can restrict the participants according to:
- Native Language
- Devices (Desktop, Android, iOS), or
- if you already ran a survey with us: a predefined team of users who participated in your previous survey
If you need to filter for other attributes as well (like specific region within country of residence, job, relationship status, ethnicity, etc.), please run a prescreening.
If your survey happens on an external tool like SoScisurvey/qualtrics/etc., you can easily screen participants within your survey, at the very beginning.
You could set up the prescreening on the very first page of your survey and automatically exclude all users who answer "no" from the survey (their IP addresses should also be blocked to prevent them from trying again via the survey link). Like this you keep these users from getting to the final page of your survey with the payment code. All users answering "yes" could be automatically led to the next page