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Credit card companies often use their own internal exchange rates, which may include a markup or spread above the wholesale market rate to account for their costs and profit.
The market exchange rate you are comparing against might be from a different day or time than when your bank processed the transaction, leading to a perceived discrepancy.
In addition to the exchange rate, your credit card may have charged a separate foreign transaction fee, which can add to the total cost and make the effective rate seem worse.
If you were offered the option to pay in your home currency at the point of sale, the merchant's system may have applied a less favorable exchange rate than your bank would have.
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