Ensuring that 3rd parties are compliant
 PCI Compliance   Compliance Overview   Does PCI DSS apply to you? 

Since PCI DSS covers your entire trading environment, all third-party partners that store, process or transmit data must also comply before you can achieve full compliance.
Third parties include:
  Till vendors
  EPOS vendors
  Software application providers
  Payment service providers
  Payment processing bureaux
  Data storage providers
  Web hosting providers
  Shopping cart providers
  Software vendors
Download Merchant Program Guide