The majority of the services being added to Substly are SaaS (Software as a Service) services, (e.g Microsoft Office 365 or Google G-suite) but could be any type of service that renews on a regular basis (e.g company cars or rent).
You can be charged for a service in different ways. The details about how you are being charged we call a 'plan'. Sometimes you'll have more than one plan for a service, e.g. you might have 2 users on a Basic plan at $10/month and 5 users on a Professional plan at $100/year.
Read more about how you add services in Substly.