The thread is already years old, but because I was just asked how the implementation looks in detail, I want to share my documentation at the time here with you.
In the meantime some things will look different, but nevertheless it should help to rebuild.
The attached PDF contains the documentation.
 

The following link leads to an article on my website that explains to my users how to use the id card. Unfortunately it's in German, so it's best to translate it in your browser.
User manual