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PCI DSS is short for Payment Card Industry Data Security Standard and is a standard for security when it comes to handling payment by card. There are several versions of PCI and every version sets different demands to how the payment data is handled. More information regarding the standard can be found here:
Wikipedia

PCI scanning, which is included in several of the Comodo SSL certificates we offer, entails that the domain secured will be scanned and assessed again the latest vulnerabilities in PCI. You can order free PCI scanning for 1 year from Comodo, and if you wish to expand the service you will need to pay extra for the serice. The standard package, which is free for 1 year can be found here:
www.hackerguardian.com/hackerguardian/buy/pci-scan-compliancy.html

You will within a short amount of time be able to order PCI scanning via the client portal and you will receive relevant information regarding the services from Comodo. It is important to be aware that the domain you order the service for restricts the possibility to use the service for free for all future SSL certificates on the domain and any subdomain of the domain. This means if you order this for mysubdomain.domene.com you will not be able to order it for domain.com at any later point in time, even though its located on a different SSL certificate.