We recommend that you use either McAfee or Trustwave. There are a large number of companies providing this service, and any one of them is able to provide a certificate of PCI compliance. However, some of them are much more difficult to work with than others, both for you and for us.

Your goal should be to confirm your site's PCI compliance through a reputable and well-known PCI compliance company. Most of our clients use either McAfee or Trustwave, so we are used to working with them and they with us. Essentially, we _know_ we can get this done quickly and easily for you with either McAfee or Trustwave. It's possible that working with other companies could add a large amount of extra work for you and us...hence our recommendation to use either McAfee or Trustwave.