By Andrew R. Johnson and Caroline Van Hasselt 
 

Total System Services Inc. (TSS), one of the largest processors of card-payment transactions in North America, said late Monday its systems were running properly after a power outage at a data center interrupted its ability to authorize transactions.

The confirmation came after several news outlets reported Visa Inc. (V) credit-card users in Canada were unable to make transactions because of a countrywide processing outage.

Total System Services, or TSYS, said one of its North American data centers suffered a "power interruption" that "impacted our ability to provide payment authorizations for some of our North American clients for a period of time this afternoon," according to a statement provided by company spokesman Cyle Mims.

Mr. Mims didn't provide additional details about how many financial institutions, merchants or cardholders were affected by the outage.

"At this time, systems are up and running and authorizations are being processed normally," the company said, adding during the outage it put in place contingency plans that involved card payment brands performing transaction authorizations for TSYS.

A spokeswoman for Foster City, Calif.-based Visa didn't have an immediate comment when contacted Monday afternoon. A spokesman for Purchase, N.Y.-based MasterCard Inc. (MA) said it wasn't experiencing any issues in Canada.

Crystal Jongeward, a spokeswoman for Canadian lender Toronto-Dominion Bank (TD) told Dow Jones that an outage involving Visa cards was affecting customers from multiple financial institutions in Canada. She said the outage was due to a third-party provider.

Canadian cardholders accounted for $57 billion, or 5.7%, of Visa's payments volume in the quarter ending Sept. 30.

Write to Andrew R. Johnson at andrew.r.johnson@dowjones.com

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