Asked about the agreement, a Gainer spokesman referred a reporter to Charleston Area Medical Center.
The Gazette first reported on the Visa ads in February. Cornelius later filed an ethics complaint.
Visa's online commercials with Gainer started appearing on the company's "Currency of Progress" website about a year ago. Visa started the marketing campaign in 2009, spotlighting the benefits of using prepaid cards over cash and checks.
The online spots included shots of the Capitol, West Virginia state flag, the auditor's office and campaign buttons that said "Elect Gainer Auditor." The campaign buttons were used by his late father, Glen Gainer Jr., who served as auditor from 1977 to 1983, according to a Gainer spokesman.
In one video, Gainer remarks, "When you run for public office -- and I am elected -- the one thing people like to say is, 'We need to run government more like a business.' If anything, we try to do it better than they do in the private sector."
In the same video, Gainer later says, "If we tried to take the cards away, I'd be run out of office."
Citibank provides Visa purchasing cards under a state contract. Gainer's office manages the program.
Visa removed the videos at Gainer's request after the Gazette reported on the ads. The auditor also asked the Ethics Commission for an advisory opinion on the matter.
In April, the commission ruled that Gainer should not have taken part in an online advertising campaign for Visa. The commission found that the Ethics Act prohibits public officials from promoting programs on a company's website.
Gainer said his appearance in the ad campaign had an "overwhelming public benefit" -- to recognize that the purchasing cards save state government $145 million a year.
The Ethics Commission opinion concluded that Gainer had "every right to be proud" of the program.
"However, in the course of promoting his office's electronic payment program, he lends prestige of his public position to a private business for which there is no overriding public benefit," the commission wrote in the April opinion.
Gainer has said he received no financial compensation for taking part in the ad campaign.
The state averages 56,000 transactions totaling $36 million each month on the purchasing cards. The cards are used for small-dollar transactions, as well as major contract payments.
Reach Eric Eyre at erice...@wvgazette.com or 304-348-4869.