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'm John Allspaw, co-founder of Adaptive Capacity Labs, where we help teams use their incidents to learn and improve. We bring research-driven methods and approaches to drive effective inciden...
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