Go to the https://docs.oracle.com/en-us/iaas/Content/VMware/Concepts/ocvsoverview.htm or a detailed description of available the payment methods.
Hourly requires a minimum of 8 hours of committed host runtime
Monthly requires a minimum of 1 month of committed host runtime.
Yearly requires a minimum of 1 year of committed host runtime
Every Three Years requires a minimum of 3 years of committed host runtime
