Concur T&E is a travel and expense software used by 25M business travelers globally. The Concur APIs allow you to access a Concur user’s travel and expense information so that you can build apps like ones that provide recommendations of nearby restaurants around a hotel booking, or apps that send a top 10 list of coffee shops based on a Concur user’s destination and expense history (e.g. He spent $80 bucks on cappuccino in the last 10 business trips).
The Concur APIs use OAuth to protect these user assets – https://developer.concur.com/api-documentation/oauth-20/oauth-20-overview
To get the source code of the app from the video, head to https://github.com/ismaelc/Concur-Windows8-SampleCode