If all projects are for software development, you will need 39 JIRA Software user licenses.
If some projects are for maintenance (incident management, subject to SLAs you are supposed to be able to report on...) then you will need Service Desk (lowest tier), and customers who only need access to the Service Desk customer portal do not need a license.
If you are looking for the monthly payment plan, you may choose between:
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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