This is a script to make it easier to generate similar invoices less repetitively.
Only works on this one city's system. This is a fast-code automation to solve a single issue and does not intend to be a robust or generic solution at any moment.
However, it can work as a show-off for similar issues.
For now, the only way to use it is by reading the code, manually editing some parts of it as you need and then copy-pasting into the browser's console in a window with the Directa system open. (probably even less productive than just using the system manually by now)
Directa's page really sucks. It looks like they tried their best to make the task of filling a simple form as hard as they could without making it obvious that they intend to make it harder