Credit card giant Visa has PayPal in its sights with the launch of its payclick micropayments system in Australia.In the 12 years since it was established, PayPal, now owned by eBay, has carved out a significant slice of the global online payments market. According to technology analyst Gartner, although Visa still handled 45 per cent of US ecommerce transactions in 2009, PayPal grew its market share to 16.5 per cent.Payclick is just one of Visa's initiatives to claw back market share. In April the organisation announced it would pay $US2 billion for CyberSource, which develops electronic payment, risk management and payment securities technologies, which analysts see as another important step to shoring up its online market share.Greg Storey, general manager of payclick, which has been established as a wholly-owned subsidiary of Visa, said that the payclick technology had been developed locally, was being launched at this stage only in Australia, and was only available for people who could provide an Australian address. He refused to outline international plans for the service, but was adamant Australia did not represent just a pilot for the service.  Visa will have to get its skates on to stop further erosion of its market share as PayPal already lays claim to more than 153 million accounts operating in 190 different markets around the world. It also has tens of thousands of online merchants allowing people to pay for services using PayPal.At the launch yesterday Visa's payclick had signed up just a handful of local merchants - although that includes heavyweights Apple and Telstra BigPond.Storey refused to comment on the competitive challenge the company faces, but claimed:  "We think this meets an unmet demand for small value payments." The organisation is banking on significant demand. It cited research by Investment Trends that predicted that in Australia in 2010 there would be $646 million of online micropayments (payments worth less than $20) made to the online gaming, music and micro retail sectors.The payclick system itself is straightforward to set up and use. People sign up for the service, provide their details, and make a series of security choices which are then recorded by Visa. The payclick accounts can be funded using Visa debit or credit cards, MasterCards, BPay or through a debit from Australian bank accounts. Up to $999.99 can be deposited in a payclick account and then spent at will.Once the payclick account is established the authorised user of that account clicks on the payclick icon on the retailer's website, responds to the preset security related questions, and the payment is automatically executed without the shopper having to provide the merchant with personal or account details.The system is being targeted at teenagers and their parents, and payclick suggests it could be used by parents to provide their kids with "digital pocket money". The catch for teenagers is that their parents can see exactly what they have bought, and even withdraw funds from the payclick accounts should chores be left undone or curfews broken.Consumers will not pay