Never heard of bill.com (I googled it) but it does not seem to provide services to companies like Adobe. Feel free to contact Adobe sales on this. The phone number is shown on the Enterprise-Teams website.
BTW: we are using a reseller and we are using our company's standard purchasing procedure. The reseller is our single point seller, as he provides us also with our Microsoft licences and Autodesk licences.
ABAMBO | Hard- and Software Engineer | Photographer