Barclaycard, the largest credit card issuer in the United Kingdom based on cards in circulation, has expanded its bPay contactless devices program beyond wearable wristbands to include key fobs and stickers. All use EMV-compliant technology from Gemalto. They are available to any Visa or MasterCard credit or debit cardholder in the U.K. When bPay launched in June 2014, only a wristband was available. More than 40,000 people have obtained one. Wristbands cost $39. Stickers, which can be affixed to phones or anything with a flat surface, cost $23. Key fobs cost $31. The devices can be purchased ...