PCI SSC Quick Reference Guide PDF

Merchant-based vulnerabilities may appear almost anywhere in the card-processing ecosystem including point-of-sale devices; personal computers or servers; wireless hotspots or Web shopping applications; in paper-based storage systems; and unsecured transmission of cardholder data to service providers. Vulnerabilities may even extend to systems operated by service providers and acquirers, which are the financial institutions that initiate and maintain the relationships with merchants that accept payment cards.

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