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The CVV codes are send in on the first Credit Card add request and as it is not stored by iPayment the gateway. The CVV code will only be validated once when adding the card. It is not legal to store the CVV code so any additional request will not have the CVV code checked.
Pre-Authorisations and Final Authorisations MasterCard Europe Mandate
Please carefully read the 11.1 topic in the file: http://www.securetrading.com/files/documentation/STPP-XML-Specification.pdf.
You will need to decide if you want to use PRE or FINAL authorization for MasterCard and you need to consider the implications of doing so. Failing to do so may result in a fine from MasterCard.
Please refer to this page for more information https://docs.securetrading.com/document/payment-pages/enhanced-post/