Ingenico, "Technical Guides." Link

Cisco, "Understanding VPNs and Their Use Cases." Link

OpenVPN, "Understanding VPN Tunneling." Link

National Institute of Standards and Technology (NIST), "Guidelines for Securing Payment Card Transactions." Link

PCI-DSS (Payment Card Industry Data Security Standard) is a set of data security requirements for handling payment card information. The standard has evolved over the years to address emerging security threats and technologies. Therefore, the official PCI-DSS website typically provides information on the current version of the standard, along with updates and resources.

To ensure compliance with PCI-DSS requirements, it is essential to implement robust security measures when configuring PDQ terminals for card transactions.

The technical intricacies of configuring and managing PDQ terminals are, of course, crucial for the secure processing of card transactions. VPN tunneling, in particular, plays a pivitol role in enhancing security by encrypting data, isolating networks, and ensuring data integrity. By adhering to specific configuration parameters and industry best practices, organisations can ensure the reliability and security of their payment processing infrastructure; which of course is the desired objectives outlined by the controls and measures defined inside the PCI-DSS published standard.