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The best way from a gadget is to call JIRA's REST API as you don't need to mess with authentication (https://docs.atlassian.com/jira/REST/latest/). If the current REST API is not what you need, just create your own REST endpoints.
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What data do you want to access? You can access JIRA REST https://docs.atlassian.com/jira/REST/latest/ by making appropriate ajax calls.
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