Worldline SA shares fell by more than a fifth on Wednesday, wiping out around €300 million ($350 million) of market value following reports that the company allegedly covered up fraud by customers.Shares in the payment firm, which describes itself as the largest European payment processer, were down almost 23% at 10:59 a.m. in Paris, having been halted multiple times after the publication of a series of articles co-ordinated by the European journalism network EIC....