Authentification with Belgian Card (BEID)

Question

I am currently working on setting up an authentication via the Belgian identity card on a web page.

I understood that the applet was abandoned.

So I do not know what to turn to, there is the extension firefox but I can not find any doc. I also understand that tax-on-web used a technic via SSL but I did not understand or find more info.

Would you have any tips to give me?

thank you