Accessing files stored on OpenText Content server

There's a duplicate thread I answered here: https://community.powerbi.com/t5/Developer/Opentext-Content-Server/td-p/809913 

I was able to read OpenText documents as data sources via their REST API but the solution isn't ideal as the only way I found involves hard coding the OpenText client credentials in the Power Query itself and not using the Power BI credential manager... I think because the OpenText API uses some specific/bespoke authentication that Power BI doesn't know how to work with.