@nlanda You can make an embedded data to save the branch info and attach querryString into the anonymous link for identification Passing Information via Query Strings.
QR code is not something fancy, just Google some free URL link to QR online and convert it and you will have 50 QR pic for 50 branch.
Hope this help
Hi,
You can create an embedded variable with in the start of survey flow with name "branch” and create links by passing &branch=1,2,3..50. E.g yourSurveyLink?branch=1 or yourSurveyLink?branch=2 or yourSurveyLink?branch=3….
Generate QR code for each branch.
You can also create an additional embedded variable as bName to pass the name.
As a precautionary measure add a term if branch value is not 1 to 50.