I don't have coding experience, but I allready got one of my forms populated with the hint of @sabanna from here
Means, I used the "Touren" collection page for the form, as the "Touren" in my project are just listed in the "Programme" collection page.
Now I need another form, what has to be populated with data from second button "voucher"
Maybe there is a way to do it with URL parameters?
Here the project link:
And the direct link to one of the programs "Programme":
Any help would be appreciated.