MILAN (Reuters) -Italy's Nexi on Thursday confirmed its 2023 guidance, sending its shares up 10% after dispelling concerns it could face similar problems as rival Worldline which lost 40% of its market value after it slashed its outlook. At 1600 GMT shares in Nexi were up 9.8% at 6.6 euros each, off the 5 euro record low hit in the wake of Worldline's alarm. Nexi has traded below its 9 euro listing price over the last year amid weakness in the payments industry which sources have said has prompt