Generally for integrating JIRA with other applications such as confluence, bitbucket and fisheye you need to have an application link between them.
Application Links (sometimes called "AppLinks") is a bundled plugin that allows you to link Atlassian applications to each other. Linking two applications allows you to share information and access one application's functions and resources from within the other.
Please see the below documents which explains in detail on How to perform the integrations.
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