User story

As a member of the Growth team, I want the integration with DataGateway to be tested in a staging environment before releasing it to production, so that we can identify and resolve edge cases and bugs prior to launching an experiment.

The Staging DataGateway is only available on production. So testwiki and test2wiki are our options.

Acceptance criteria

The feature is deployed and functional in testwiki, receiving its data from (staging) DataGateway.
All critical workflows are tested (including both expected and edge case scenarios).
Any identified bugs are logged, triaged, and either fixed or explicitly documented as acceptable before release.
QA sign-off is received confirming the feature is stable and ready for production.