Similar with early PayPal integration. I played a mmorpg for a while and figured out that when buying credits and they sent the request to PayPal it was a post.

Similar with early PayPal integration. I played a mmorpg for a while and figured out that when buying credits and they sent the request to PayPal it was a post. Using Firefox tamper data I would modify the request to submit $1 and on return set it to $20. Had a similar hack occur on a clients website at work. They sold flowers I think, and gift cards. But the max value was like $30 and we got gift cards for $100/$1000 but they only paid $1. I wasn’t invoked in that bug report but I suspect it was a similar issue. The good old days.