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    MasterCard and Discover AVS Codes

    Domestic
    Code - Definition

    Y -- Address and 5-digit Zip Code match
    Z -- 5-digit Zip Code matches only
    A -- Address matches only
    N -- Neither Address nor Zip Code match
    X -- Address and 9-digit Zip Code match
    W -- 9-digit Zip Code matches only
    U -- Address info not verified for domestic transaction. Returned if the US bank does not support non-US AVS or if the AVS in a US bank is not functioning properly
    R -- Retry - System unavailable
    S -- AVS Service not supported

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