Multiples customers, single credential, multiple hosts

[darenw]

Hello,

Scenario: I have hundreds of customers who monitor hundreds of systems. Each customer typically has a single credential s/he uses for all his/her monitors.
What's the best practice for having each customer's credential in a single location to store the password since it has to be change once every 90 days and we don't want to have to change across hundreds/thousands of hosts?

Thanks,