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We do have a modded version of the webid auction script at http://www.123veiling.net/allsell_newi/. We do have several payment gateways like paypal (standard), multisafepay.com and mollie.nl (both were build-in later).
We now also want to add the sisow.nl payment gateway so winners of auctions can pay the final price to the seller. We cannot find english API documentation at https://www.sisow.nl/ but there's a lot of example code at https://www.sisow.nl/algemeen/implementatie and dutch API documentation available which should help (http://www.sisow.nl/downloads/REST321.pdf).
Your team will instantly get FTP + mysql access to a newly installed version which is hosted on a fast server.