How does cloud app pricing work?
Cloud apps are sold as a monthly or annual subscription. You are eligible for support and automatic version updates as long as your subscription is active.
When your subscription renews each month, you are automatically billed for apps based on the number of users in your instance.
If app pricing changes after your initial purchase, there's a 60-day grandfathering period during which you can renew based on the old pricing.
Source: https://marketplace.atlassian.com/apps/1212995/staffing-timeline?hosting=cloud&tab=pricing
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