The docs contain the information you requested: https://confluence.atlassian.com/cloud/cancellations-744721616.html
Go to Manage Applications in Billing. If you want to stop JIRA you can just stop JIRA; if you want to cancel the entire site you can do it from there too.
Hope this helps.
I have multiple projects that use variations of the same base workflow. The variations depend on the requirements of the project or issue type. The variations mostly come in the form of new statuses ...
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