WDI-35.05% WCAGY-28.71% DAX+0.40%  Markus Braun has resigned as the chief executive of German payments processor Wirecard, a day after the company said it couldn’t account for roughly a quarter of the cash on its balance sheet.In a terse statement, Wirecard WDI, -35.05% WCAGY, -28.71% said Braun resigned by mutual agreement and with immediate effect. James Freis, the former FinCEN director and ex-chief compliance officer of Deutsche Börse, was named interim chief executive of Wirecard after joining the board only on Thursday night. Wirecard also suspended Jan Marsalek, the chief operating officer.Shares of German payments processor Wirecard plunged...