RECOMMENDED READING
Authorization and authentication for apps in SharePoint 2013 — http://msdn.microsoft.com/en-us/library/office/apps/fp142384.aspx
OAuth authentication and authorization flow for cloud-hosted apps in SharePoint 2013 — http://msdn.microsoft.com/en-us/library/office/apps/fp142382.aspx
How to create high-trust apps for SharePoint 2013 using the server-to-server protocol — http://msdn.microsoft.com/en-us/library/office/apps/fp179901.aspx
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