# Merchant Category Codes

One important request parameter is `mcc`, for [Merchant Category Codes](https://en.wikipedia.org/wiki/Merchant_category_code).

This Parameter is optional but **very helpful for good results.**

MRS uses MCCs in various ways to help identify the correct merchant. A key example is MRS uses MCCs to assist in identifying Automated Teller Machine (ATM) transactions. The code for automated cash disbursements is `6011`. This is helpful because in some cases, ATMs are not easily identifiable from the merchant description.

Also, certain airline, hotel and car rental companies have their own unique MCC code and if an MCC is provided it can help to identify the correct merchant.

Finally, an MCC can be used as an extra parameter to distinguish between different businesses that might share a name (for example the Metro Department store, Metro Supermarket and Metro Gas Station).


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