One of Germany’s biggest fraud trials in decades has begun in the southern city of Munich. The former boss of payments provider Wirecard, Markus Braun, and two co-defendants face charges of forming a criminal gang, falsifying the group’s balance sheets and cheating lenders out of €3.1 billion ($3.26 billion). The 89-page indictment is scheduled to be read out over several hours at the start of the trial on Thursday, taking place in an underground high-security wing next to Stadelheim Prison, the largest prison in Bavaria. Wirecard was a payment service provider at the interface between credit …