The Macy's and Best Buy situations only involved debit card transactions, but the one-million Starbuck transactions involved both credit and debit cards, said Starbucks spokesperson Trina Smith, who wouldn't break down how many of each card type was involved.
That information is critical because such an error would be minimal for most credit card customers, who might not even be aware of it until they see the credit on their statements. But for debit card customers who keep just enough of a balance to cover checks, such double charges might cause checks to bounce and other problems. That couldn't be fixed with a mere credit for the overcharges.
Another distinction between the earlier glitches is that Macy's and Best Buy ran into their problems at the POS, with systems indicating that a charge had not gone through when in fact it had. With Starbucks, the POS charges—and the receipts given to customers—were perfectly in order. The problems kicked in hours later, in the settlement processing area, Smith said.
The glitch happened on May 22 and May 23 and credits to fix the problem were all issued by the end of May, according to a Starbucks statement.
"We apologize for the inconvenience to our impacted customers and are relieved that the issue has been fully rectified," the statement said.
Unfortunately, the issue seems to be far from fully rectified, as Starbucks has declined to say how the glitch happened, how others could avoid the identical issue and how Starbucks plans to prevent it from happening again, assuming they do indeed plan to try and prevent it from happening again.
The Associated Press reported that the error happened only at the 7,800 company-owned Starbucks locations.