Visa has provided its Operating Regulations here:
As Visa Inc. continues to serve the needs of our clients, we are committed to providing our partners with greater insight into Visa’s operations. We are pleased to provide access to the Visa International and Regional Operating Regulations as part of our effort. While Visa’s Operating Regulations govern our client financial institutions’ use of the Visa payment system, we believe that providing access to them will benefit all of Visa’s stakeholders.
May not be a bad reference and provide some insight to Visa’a operations. There is a good “Glossary” and Merchant Category Code listing in the document as well, near the back.