It would be better for your Confluence user to also have a JIRA account, but that's not strictly necessary. The Application Link between JIRA and Confluence can be set up in different ways. If you use OAuth without impersonation, you need to set up a pre-configured user that has access to JIRA. All queries to JIRA from Confluence would use the permissions of this pre-configured user.
That being said, it's much better to use OAuth with impersonation if you have the same user base. The user would need to provide JIRA credentials once, and an access token would be saved to "link" the Confluence user to the permissions of the JIRA user for query purposes. That's the safest and most reliable way to do this, since the Confluence user will then have access to all JIRA issues that he's authorized to see, no more, no less.
So, in short: It's not strictly necessary, but you should set up a JIRA account for your user anyway.
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