The Payment Card Industry Data Security Standard (PCI DSS) is a set of requirements designed to ensure that ALL companies that process, store or transmit credit card information maintain a secure environment.
Merchants and software vendors must be certified by PCI and report their compliance with the industry standard for consumer security. If any customer of an organization ever pays the organization/merchant directly using a credit card or debit card, then the PCI DSS requirements apply.
The Standard can be found on the PCI SSC's Website:
https://www.pcisecuritystandards.org/security_standards/pci_dss.shtml
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