Gumtree Group, the Australia-based company behind classified sites Gumtree, AutoTrader, and CarsGuide, has announced a partnership with payments provider Adyen. The partnership aims to enhance customer experience and safety by integrating Adyen's payment system into the Gumtree sites, with an expected incremental revenue of AUD500,000 to AUD1 million in the first year and AUD2 million in the second year.