As per the official Atlassian FAQ here you need to purchase a licence for the number of users you have in JIRA.
A quote from the FAQ to state this is shown below.
"Purchase the license tier that matches the number of users you have licensed for your host application. For example, if you have a 25-user JIRA Software license, purchase the add-on at the 25-user tier."
I hope this helps.
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