MILAN (Reuters) -Italian payments group Nexi is in exclusive talks to buy the retailers’ payment business of BPER Banca, a person close to the matter said, confirming a report by Bloomberg News. A deal could be worth around 350 million euros ($396.73 million), the person said. In a conference call after the group’s fourth-quarter results earlier this month, Nexi’s Chief Executive Paolo Bertoluzzo said the group could consider new M&A opportunities, mainly in areas where it is already present. In Italy, in the past few years, Nexi bought the retailers’ payment businesses of Intesa Sanpaolo and …