Import Excel File From SharePoint using Rest API

[rjhale]

I've created a custom connector in Microsoft Flow to interface directly with Power BI using the Power BI OpenAPI definition.  https://github.com/Microsoft/PowerBI-CSharp/blob/master/sdk/swaggers/swaggerV2.json

I'm attempting to import an Excel file that sits in one of our SharePoint sites, but I'm having problems with the Post Import syntax.  Can anyone provide an example of how the body json should be constructed when Posting an Import?  I'm not sure which parameters need to be included and what the difference between filePath and fileURL as it relates to these parameters.

Any help getting this working would be much appreciated.  

[rjhale]

I could really use some help figuring out what the body of the Post Import action is supposed to look like when importing an Excel file.  Do I need to include connectionType, filePath, and fileURL?  If so, I'm not entirely sure what a shared access signature url is?