LimeSurvey.

1 · Pass the Samply IDs into the survey

"Panel integration" (Survey menu → Panel integration → Add URL parameter), each parameter mapped to a Target question so it is saved into the response and export.

1. For each Samply parameter, first add a free-text question to hold it — type "Sort text" (Short free text) or "Multiple texts" — with a clear code such as samply_msg; optionally hide it.
2. Go to Survey menu → Panel integration and click "Add URL parameter".
3. In "Parameter" type the exact GET key from the start link (e.g. msg), and in "Target question" select the matching free-text question. Repeat per parameter.
4. Always set a Target question — without one the value lives only in the session and is NOT written to the export.

2 · Register completion

The End URL (Survey text elements) with the {PASSTHRU:msg} placeholder, plus "automatically load the end URL" enabled in Presentation so it redirects on completion.

1. Make sure %MESSAGE_ID% is defined as a Panel integration parameter (e.g. named msg) so {PASSTHRU:msg} is available.
2. Survey settings → Text elements → set End URL to: https://samply.uni-konstanz.de/studies/<study-slug>/done/{PASSTHRU:msg}
3. Survey settings → Presentation → enable automatically loading the End URL on completion, so the participant is redirected (not just shown a link).
4. Activate and test: {PASSTHRU:msg} resolves to the value LimeSurvey received in the start link.

Reserved parameters & gotchas

Do not reuse LimeSurvey-reserved start-URL keys: sid, lang, token, newtest. Use names like msg, pid, code. {PASSTHRU:name} only works if name was first defined under Panel integration.

Things to watch out for

• The exact wording of the Presentation toggle that auto-loads the End URL varies across LimeSurvey 3.x/5.x/6.x — confirm it in your installed version.

Sources

These steps were verified against the platform's official documentation.

• https://www.limesurvey.org/manual/Panel_integration/en
• https://www.limesurvey.org/manual/URL_fields