This is cool. The real trick is getting a Bürgeramt appointment to submit this form. The official portal for that is a punishing exercise in bad UX. Basically, there are very few appointments available, so you have to keep refreshing the calendar page and hope that one of the dates is linked. It took me 2 weeks of opening that page multiple times a day and refreshing over and over. It gets hammered by bots as well and if you don't click the link fast enough it will disappear. There are multiple bots available on Github and I think there is also a Chrome extension now. But, they all do the same thing (refresh the page) and will get your IP banned if you run them without long timers. I tried all of it and the only thing that worked was having a Favorite in mobile Safari that I opened whenever I had idle time. I finally got one in a coffee shop and nearly knocked the table over because I was so happy.