scrlttr2 is well suited for using
window envelopes by default. That means that it prints the address at the
In Germany, you can buy online postage which is supposed to be printed on the envelope or on the letter into the window area next to the address.
Using the window area is of course more convenient.
The German Post Office ('Deutsche Post') only provides an integration for Microsoft Word (of course ;)).
Thus my question: How to include online postage in a
The online postage is available at the Deutsche Post. I used the output format 'DIN A4 Normalpapier (Einlegeblatt)' (which is only available if a recipient is entered - a single character will do). You can get a sample file there. Since the page is in german I put the resulting sample PDF-file also on a private web-server.
The standardized position of the window is well explained in Wikipedia - the article is in german, but the figure contains all the information.