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Test American Express Card Verification {#payments-testing-amex}
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Before using CVN with American Express, it is strongly recommended that you follow these steps:

1. Contact customer support to have your account configured for CVN. Until you do this, you will receive a `1` in the ccAuthReply_cvCode response field.
2. Test your system in production using a small currency amount, such as one currency unit. Instead of using the test account numbers, use a real payment card account number, and send an incorrect CVN in the request for authorization. The card should be refused and the request declined.  
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