OK, so as it is obviously not clear how online access panels work I will try to give a little more clarity than what I had written on my phone before.
1. Online Access Panels are a kind of "club" with members that have signed up to answer surveys and getting points/rewards for it. Online Access Panels deliver samples of the target group to market researchers.
2. If you contract a panel, they will send a certain amount of members of their panel to your survey. However, they need to be able to reward those that completed the survey they need to know who participated, who was screened out because they didn't fit the criteria, who was screened out because they ran into a quota, etc,
3. Each panel member has an ID, here probably the RID. They are identified by this ID. So somehow the panel provider needs to know the ID of each respondent that has finished, was screened out, ran into a quota, etc.
4. This is why they ask you to pipe this RID through your survey to the different end urls (for finished respondents, for screen outs, for quotas, etc.). So they give you different URLs to redirect to for each case. So far so good. But in this URL they need you to pass on the RID so they can identify each individual case.
5. To be able to identify each respondent they use the RID. However, the link that you are showing is the normal simple survey link from Limesurvey, it is not individual for each respondent, but rather a "one fits all". As you don't know the ID of the respondents, you can't pass the respondent ID (RID) to the end urls.
6. This is where the survey url comes into play. You give this survey URL to the panel and they will add an individual variable (in this case the RID) to the links send out to their respondents via an invite. If you use the URL you have posted nothing will happen. Respondents can fill the survey, but you don't know who fills the survey, because the link is the same for everyone. You only have the SID, which is the survey ID, that's it.
survey.dlr-pt.de/index.php?r=survey/index&sid=365867&lang=en
Now, once you pass this link to the panel they will adapt the links so they are individual for each respondent. They will pass the RID via the URL to you, you need to store it in your survey and then include it into the different end urls.
So we know they want you to pass a variable called "RID" to the different end URLs, so they will need to send you the individual "RID" of each respondent via the survey link.
The link they will be sending out to their respondents will look something like this, with XYZ being the respondents individual RID (different for each respondent).
survey.dlr-pt.de/index.php?r=survey/index&sid=365867&lang=en&RID=XYZ
If you don't get the RID in, you can't get it out. Simple as that.
I answer at the LimeSurvey forum in my spare time, I'm not a LimeSurvey GmbH employee.
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