PCI DSS (Payment Card Industry Data Security Standard), is a widely accepted set of policies and procedures intended to optimise the security of credit, debit and cash card transactions and protect cardholders against misuse of their personal information. The PCI DSS was created jointly in 2004 by four major credit card companies: Visa, MasterCard, Discover and American Express. Companies such as doctorSIM that comply with the PCI standard must undergo regular audits and scans to ensure customer data and payment procedures are performed to the highest standards of quality and security.