Wedding officiant question

Two of my best friends legally and officially wed last year, but they did not have a ceremony for their family and friends. Now, a year later, they are having that traditional ceremony. They have asked me to act as wedding officiant at this ceremony. I don't need to be ordained or certified, correct? This ceremony is only for show, so I went ahead and accepted the "job" (for no payment, of course). This sounds legit, right?