E-commerce platform Four51 has achieved the Level 1 Payment Card Industry compliance as a service provider. The Four51network connects buyers, distributors and suppliers of indirect goods such as printed materials, promotional products and office supplies. The Level 1 PCI compliance allows for third-party verification of the security of the transactions which are processed on the Four51 network.

As a PCI compliant credit card processing service provider, Four51 must follow a standard set of twelve security practices, including the installation of a firewall configuration to protect data, encrypting the transmission of cardholder data and sensitive information on public networks, restricting access to data by business need-to-know. Four51 is also required to assign a unique ID to each person with computer access and monitor all access to network resources and cardholder data.