Worldline is a work in progress. That was investors’ verdict on the 16 billion euro French payments group after it set out growth targets on Wednesday. The company led by Chief Executive Gilles Grapinet has become a major European player by swallowing up rivals. Now it’s promising annual revenue growth of 9% to 11% over the next 3 years. By 2024 it expects to convert almost 30% of its top line into operating margin before depreciation and amortisation (OMDA) – a measure like EBITDA – from a pro forma 23% last year.