When you're looking for your merchant category code (MCC), the best place to start is with your merchant account provider. They can give you the code that corresponds to the type of business you have. If you don't have a merchant account, or if you're not sure what your MCC is, you can look it up in Visa's directory of MCCs.
To find your MCC, start by logging in to your account on the Visa website. From there, click on the Support link at the top of the page. On the next page, scroll down to the Merchant Category Code section and click on the View Directory link. This will take you to a searchable database of all MCCs.
Type in a keyword that describes your business (e.g., restaurant) and hit enter. A list of matching MCCs will appear, along with their descriptions. Find the one that best matches your business and note down the code. That's all there is to it!