For a new subscription you must first request a personal APAM badge, which is valid for five years.
To request a badge, you need to fill out the application form with the required data and hand it in with your passport photograph and a copy of your identity card (or that of one of your parents if you are underage).
If you are subscribed to a yearly pass, you can travel only with your pass without carrying your personal badge. But if you are subscribed to a monthly or weekly pass, you are required to carry with you both your personal badge and the counterfoil of your pass.
You can buy or renew a monthly pass in official points of sale from the 20th of the previous month until the 1st of the month of validity*.
You can renew your subscription up to 8 days after the expiry in official points of sale.