With Apple Pay coming online today in the U.K., British bank Barclays has confirmed it will allow its customers to use service, Reuters reports. Barclays — the last major holdout in negotiations to bring Apple’s contactless payment system to U.K. consumers — will allow its credit and debit card users to enroll in the service, but didn’t set a timeline for when it would be available. Another major bank, HSBC, has experienced technical…