A key metric for payments company EML is gross debit volume - a measure of the volume processed through the company's various payment platforms. The company says this figure is a proxy for customer demand.EML's gross debit volume rose 34 per cent to A$9.03 billion during the year to June, with contributions from its commercial payments division and the gift and incentive division. The general purpose reloadable cards division was an underperformer, with a significant fall in volume.Debit volume translates into revenue at different rates according to the program and region. Revenue rose 37 per cent to $97.2 million, EBITDA was up 40 per cent to $29.1 million and net profit rose 283 per cent to $8.4 million.The company's biggest division is commercial payments and also its best performer. Its gross debit volume rising 96 per cent to $5.2 billion.Two of the biggest clients in this segment are US bill payment providers. The company said the business benefited from the launch of new programs during the year, as well as organic growth. Debit volume grew 52 per cent to more than $1 billion in the gift and incentive division. This segment provides single load gift cards for shopping malls and incentive programs.The company expects to see continued strong growth in this segment, following completion of its acquisition of European company Flex-e-Card in June. The new business increases the company's number of mall gift card programs by 226 to more than 900 globally.One program, launched in March, provides an incentive card for a health insurance company to reward customers with a single load Visa card for getting health check-ups.Another program launched during the year allows money to be sent to an Apple, Samsung or Google digital wallet, with no plastic involved in the process. It is the company's first move into cardless payments.On the negative side, gross debit volume from general purpose reloadable cards fell 18 per cent to $2.7 billion. The company said the decline was attributable to the performance of a single North American program - LuLaRoe, a clothing marketing company.This part of the business includes cards used for gaming payouts. New programs launched during the year included bet365 and PointsBet in North America.It also includes salary packing and "alternative banking". Nordic bank Instabank uses EML to issue cards to customers loaded with loan funds that can only be used for approved transactions.