Attached are some valuable resources that could be very helpful for your operation. There are three cheat sheets listing the chargeback codes for all four major credit card companies - Visa, Mastercard, Discover, and AmEx. These cheat sheets have been created by a company named Chargebacks911.

Please note that PropertyBoss is not affiliated with or integrated with Chargebacks911. However, their cheat sheets provide a comprehensive and easy-to-use reference for understanding and managing chargeback codes.