All client websites, applications, and environments that process, store, or transmit payment card data are required to be fully compliant with the Payment Card Industry Data Security Standard (PCI DSS). PCI compliance is critical to protect cardholder information, prevent fraudulent activity, and preserve customer trust and business continuity. Clients have the option to use PCI-compliant payment processors like Authorize.NET or Stripe on their websites. Clients who develop, implement, and maintain their own payment processor must provide proof of compliance, including the PCI Attestation of Compliance (AOC).