EBay is one of the worst offenders for legacy crap. I had to integrate a website with eBay and literally 50% of the website doesn't work, especially all the dev

EBay is one of the worst offenders for legacy crap. I had to integrate a website with eBay and literally 50% of the website doesn't work, especially all the developer facing bits. The entire sandbox site is running an older version that doesn't work anymore so you have to test in production. Every page you load has its own subdomain and style sheet which often requires you to log in again. The docs are full of broken links and the api is XML hell. After all that I finally got it all working and then eBay shut down our account just before the Christmas period requesting we send them thousands of receipts for all of our products. EBay needs to die, and fast.