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Follow the steps detailed in Configuring Atlassian Jira Issue Lookup in Workbench. You will then and enter your values into the page so that you have a page form that looks something like this:
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Now all of your currently registered projects will use this Jira configuration by default and you can choose to move to another issue management service or server by creating another configuration. To create additional issue management services simply click the '+' icon in the top right hand corner.
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