Why won’t my card with Merchant Category Code (MCC) restrictions work at certain businesses?

It depends how the business has set up their MCC. For example, some businesses like a post office may offer gambling purchases along with other goods. The transaction could be blocked due to the merchant category code being set up as an establishment that offers gambling. Credit Union SA cannot determine what merchant category code the business is set up as and is reliant on the business applying the appropriate category code.

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