Please make sure your clients survey system can receive and pass on variables from URL’s. Professional survey scripting systems support this feature. The Q One Platform redirect links contain 4 mandatory URL additions and linked variables: projectid, q, qresult and id. The URL addition &id= comes with the search and replace field [id]. When you send out invites via the Q One Platform to your panel members, this search and replace field is replaced with the actual panel member ID. Your clients survey system needs to capture this ID and pass it back on to the Q One Platform via the URL in the same format  as on the projects overview page, landing pages tab. Only if the clients system is capable of capturing and passing on variables, both systems are correctly linked and can work together.