The buy.at brand retires. Privacy. Access the buy.at platform. buy.at has rebranded to its global patent company, Affiliate Window. This coincided with the US launch of Affiliate Window’s innovative and award-winning platform for advertisers and publishers.. Log-in to the Affiliate Window interface. The launch provides an intuitive platform for advertisers and publishers, complemented with dedicated support, innovative tools and reliable tracking and will see parties benefit from an enhanced ...