HELSINKI, Aug 2 (Reuters) - Shareholders in Finnish forest industry group UPM-Kymmene on Thursday authorised an issue of 12.3 million new shares to help fund its acquisition of German papermaker Haindl. ``The subscription price will be 34.071 euros per share,'' the company said in a statement. The share issue will be in partial payment for the cash-and-stock acquisition. The shares would be offered to certain G. Haindl'sche Papierfabriken KGaA shareholders once the acquisition agreement has been fulfilled, UPM-Kymmene said. UPM-Kymmene announced the acquisition of Haindl for a total of 3.64 billion euros ($3.21 billion) in May. The deal is now being vetted by European competition authorities, but UPM has said it expects clearance for the deal in November. UPM-Kymmene has agreed to sell two of Haindl's six mills to Norwegian papermaker Norske Skog for 1.1 billion euros to pre-empt European Commission concerns about competition.