Hello t3000,
Thank you for your request.
When purchasing the Half Fare Card online, you can enter the data for the following documents online: Passport or ID card from Switzerland, Germany, Austria, France, Italy and Liechtenstein.
At the counter you can also get ID from other countries, there is a list with all accepted ID: Accepted ID documents: Akzeptierte Ausweisdokumente (swisspass.ch)
Have a nice day
Greetings MelanieD