The Cardknox API integrates payments into online, mobile, and in-store applications. It uses the same URL for sandbox and live accounts and it requires xKey to authenticate. The API supports Credit Card, Check (ACH), EBT, Gift Card and Fraud Protection transactions. Cardknox is a developer-friendly payment system.
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This .NET SDK enables the Cardknox payment processor in applications. The latest version is 4.5.3. This package supports credit card transactions, ACH, gift cards, EBT transactions, and fraud prevention.