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To use the Herzum Amplifier for JIRA app Mattermost for JIRA app, you must first install your Mattermost instance.
Java must be installed on both Mattermost and JIRA
Please refer to the following documentation for installing and configuring your Mattermost environment.
https://docs.mattermost.com/guides/administrator.html- environmentsPlease refer to Atlassian documentation for installing JIRA Server.