How Many Different Access Codes

I am interested in Ring for business My primary question is: how many people can I give personal access to arming and disarming the alarm? I am less concerned about break-ins because my office suite is in an office buildling. BUT the keys can be copied at the hardware store. So I need a way for employees to know that a key is not the actual access to the office. You must have an alarm code too. No alarm code (or cancelled alarm code because you're not an employee any longer) and you should not try to gain access to the office suite. I am having trouble finding a simple system that allows more than 10 individual codes. How many can the Ring support?