Our team is using JIRA Service Desk and it's at the latest version (3.5.0) as of this date, I've seen a post here saying that exporting customer list as .csv file became possible in July this year, yet I can't find the "Portal customers only" button when I navigate to "User management" section. Following is the link to that post:
You can use our app, the Better Excel Plugin, to export user accounts from Jira and it is compatible with Jira Service Desk, too.
It is not clear whether the "customer" in your original question is an actual Jira user. If it is, then it will work.
(Disclaimer: this is a paid app and I am a developer.)
You can easily send a REST call to the Service Desk API:
(There may be an alternative by using some in-process API provided by Service Desk, but approach outlined above should be the most standard and future-proof one.)
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