You aren't accredited to be following PCI because nobody is. There is no certificate. There is no special seal of approval. You provided security information to your acquiring bank(s) and you were allowed to process credit card transactions. There's no such thing as certification or accreditation for PCI.
No, there's no certificate, but there is a process of documentation and testing commonly referred to as "certification" before you are allowed to process credit card transactions. I work in point of sale software development and have had to help retail chains overcome problems found in their certification tests. You either don't know what you're talking about, or you're playing a pointless semantic game.