So, Costco runs AS/400 in stores, and their online store is in .Net MVC. I worked with both technologies and often have to communicate with AS/400 devs and they are close to their retirement so little fucks are given. Plus, working with DB2 is annoying in general, the .NET data provider from IBM is expensive and sucks.
Now onto the bug, when you purchased items online at a discount, you were able to return to store at a full price as their systems were not communicating that a discount was applied. I returned several items, but did not realize until I bought a laptop that was $400 off and tried returning it. I ended up calling Costco and letting them know. Unfortunately, they didn't give me any lifetime membership or a good citizen award.
If any Costco devs read this and know about this send me some love.