Deploy Add-in package to the App Catalog (v 1.12)
Upload App
In the App Catalog click Apps for SharePoint (see below image)
Click new app (see below image)
Click Browse... and choose the .app file. Then click OK. (see below image)
In the Apps for SharePoint list check that the package is enabled and valid (see below image)
Register App
Go to the browser URL and delete the part after <sharepoint-url>.../_layouts and add /appregnew.aspx
You should get a form asking for Client Id, Client Secret etc like in the below image:
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Paste the Client Id: 1a00be32-7025-467b-ae12-93e887478b48
Click Generate a Client Secret App key
Title: Confluence Content
App Domain: Confluence host of the confluence base URL - that means without https:// e.g. communardo.de
Redirect URI: Confluence base URL with path: /plugins/servlet/csi/sp/provider attached, e.g. https://communardo.de/plugins/servlet/csi/sp/provider
The add-in can now be added by users to sites.