Story updated to include new MasterCard and Visa statementSAN FRANCISCO ( TheStreet) -- Visa ( V) shares were slipping in after-market trading after a report came out noting that the payment network's website was down this afternoon. Earlier Wednesday, payment network rival, MasterCard's ( MA) website was also down, one day after the payments firm said it was disassociating its network from the controversial WikiLeaks website. Visa said in a statement that its corporate website was "currently experiencing heavier than normal traffic." The company is "taking steps to restore the site to full operations within the next few hours." However its processing network, which handles cardholder transactions, is functioning normally and "cardholders can continue to use their cards as they routinely would" since account data is not at risk, it said. MasterCard issued a statement Wednesday saying that it had made "significant progress in restoring full-service to its corporate website." The card network's "core processing capabilities have not been compromised and cardholder account data has not been placed at risk," the statement said. "While we have seen limited interruption in some web-based services, cardholders can continue to use their cards for secure transactions globally." At last check, it seemed that some functionality to MasterCard's website had been restored but not all. Visa's website was still down. According to several published reports, internet hackers, supposedly supporters of WikiLeaks, have bombarded both companies websites in order to overwhelm the systems.