I think you will make tremendous profits if you sell VR cards online.

I think the "office supply" code is something that is assigned to your business by the payment processor.
http://web.archive.org/web/200707102...cc_booklet.pdf

The MCC is assigned by the Acquiring financial institution when a supplier first begins accepting Visa payment cards. The MCC is assigned based on the supplier’s primary line of business. For example, if a supplier primarily sells computers, it may be assigned MCC 5732 “Computer Hardware”. If a supplier primarily repairs computers, it may be assigned MCC 7379 “Computer Maintenance, Repair, and Services”.