Um... "Now warnin' lights are flashin' down in Quality Control..."
First, exporting an InDesign doc to Fixed Layout EPUB is about as simple as it gets, not much more involved than exporting a PDF.
Second, a PDF is not the right (or at least best) source document for conversion to EPUB.
Third, fonts are inherently embedded in both PDF and FXL EPUB; there is little or no reason to provide them separately, especially to a nominal professional who should have the same access to industry fonts.
All of this is a bit like a mechanic asking you to provide your car's service manuals and for you to bring your tools as well.
There are a lot of "vendors" in this field who, put politely, are not at a level to be providing client services. All of the above sets off my warning bells. Just sayin'.