With your business on Office 365, you can review your monthly bill, see your subscriptions, and who is using them.
Sign into Office 365 with your Admin credentials
Select the app launcher icon in the upper-left and choose Admin.
Choose Billing and then select Subscriptions.
If you have multiple subscriptions, they'll be listed on the left. Click each to see the status.
Go here for a video on how to view your bill, update a payment credit card, or manage your subscriptions and licenses.