A Merchant Category Code (MCC) is a four-digit number used by card companies to classify a business by the goods and services it provides. When activating a Square account, you have the option to set your MCC by selecting a business type. Your MCC code should directly reflect the type of business that you conduct. For example, a veterinary clinic should select the merchant category code Veterinary Services.
If you’re a sole trader, select a specific business type to best reflect the goods or services you provide.