Confluence/SharePoint integration has been a sore point for some time, specifically because Atlassian's SharePoint Connector didn't support O365 and O365 has been the default version for a good long while. Atlassian have now moved responsibility for the Connector to a partner called Communardo, and you can find the documentation, FAQs and Support pages here. It's not immediately clear whether SharePoint 2013 is supported yet, but the info on supported versions should be on their somewhere.
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