Markus Braun, the former CEO of Wirecard, has been arrested in Germany after $2.1 billion went missing at the digital payments company. Munich prosecutors confirmed Tuesday that Braun was arrested on suspicion of possibly having inflated Wirecard’s balance sheet and sales through fake transactions with third parties in order to make the company more attractive to investors and customers. Wirecard acknowledged on Monday that €1.9 billion ($2.1 billion) in missing cash, which made up roughly a quarter of its …