It seems like our activities on Partner Edge are not commonly known.

Let’s change that:
On February 15, 2019 we ran a Partner Edge Webinar that contained

• A Sales/Pre-Sales View of Concur in the Context of ByDesign including a Concur Expense walkthrough
• A deep dive of the ByDesign/Concur integration covering
  • Functionality (Ins and Outs)
  • Status update
  • Information Assets
  • How to set up the integration
  • How to run the integration

As to publicly available information:
Use the SAP Help Portal: https://help.sap.com/viewer/product/SAP_BUSINESS_BYDESIGN/1905/en-US?q=concur  You will then find the SAP Business ByDesign and Concur Integration Guide.
Please note: The direct link in the line above will change with the release cycle and thus only delivers the most up to date document for release SAP Business ByDesign 1905.