Billing Modes

COC provides two billing modes: yearly/monthly and pay-per-use.

Yearly/Monthly billing is a prepaid mode, in which you pay for the service before using it. Your bill is settled based on the subscription period. The longer the subscription term, the higher the discount. This mode is a good option for long-term, stable services.
Pay-per-use billing is a postpaid mode. In this mode, you pay for what you used. This mode allows you to adjust resource usage easily. You do not need to prepare resources in advance, and will not have excessive or insufficient preset resources. This mode applies if resource requirements fluctuate.

Table 1 lists the differences between the two billing modes.

**Table 1** Billing modes
Billing Mode	Yearly/Monthly	Pay-per-Use
Payment	Prepaid	Postpaid
Billing Items	COC (professional edition) Resource management Multi-cloud management and optimization Enterprise O&M process management Fault management Change management O&M BI dashboard Service resilience Fault drills (basic edition) Fault drills (professional edition)	OS version changes: The number of changes for each instance at a time. Scenario-specific jobs: You can execute custom, public, or scheduled jobs.
Specification Change	All resources except O&M BI dashboard support specification change.	Not supported