Some Bank of America customers have been double-charged for purchases made with Apple Pay, the payment system Apple launched on Monday.

Roughly 1,000 transactions made with Apple Pay were logged twice in customer accounts, said Tara Burke, a spokeswoman with Bank of America, which is one of the largest U.S. banks and was an Apple Pay launch partner.

“We apologize for the inconvenience and are correcting the problem,” said Burke.

The duplicate transactions should be removed by the end of Wednesday.

Apple Pay utilizes a secure chip inside Apple’s new iPhone 6 that enables the phone to emulate an NFC (near field communications) payment card. When the Apple Pay app is loaded with a customer’s credit or debit card, payments can be made at NFC terminals by bringing the phone close to the terminal.

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