See https://marketplace.atlassian.com/plugins/com.thed.zephyr.zapi/server/pricing - the add-ons for DC are the same as Server.
But, as DC can have different user tiers, bear in mind that "An Add-on needs to meet or exceed your Data Center license." (from https://confluence.atlassian.com/enterprise/jira-data-center-add-ons-640352348.html )
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Any other country that celebrates Midsummer holiday (this friday 22 June)?
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