The talks, which began when Visa approached Visa Europe, are at an early stage and could fall apart if the two sides cannot agree on a price, Bloomberg said. Visa’s shares were up 4 percent at $69.29 on the New York Stock Exchange on Friday. Visa said last year it might have to pay more than $10 billion to buy its London-based European licensee, Visa Europe, if the owners exercised their option to sell it.