OnePay, the fintech company supported by retail giant Walmart Inc. (NYSE:WMT), has reached a valuation of more than $4 billion, marking a significant leap in its growth trajectory. This new milestone came through a recent share buyback program for employees, which priced the company’s shares at a level reflecting this enhanced worth, according to sources familiar with the transaction.As reported by Bloomberg, the development represents a jump from OnePay’s previous valuation of $2.5 billion, set in late 202 ...