Obsidian

Obsidian is a credit card company owned by Jay G.

History
When Jay G befriended Mr. Burns, he gave Burns an Obsidian card and got him to use it. Burns became addicted to spending money and eventually became bankrupt. Burns was confused as to why Jay G would get him addicted to spending money until he found out that Jay G was the CEO of Obsidian.

Mr. Burns was the only other known customer, and possibly the only other customer, since his card number was 0000 0000 0000 0002 whilst Jay G's was 0000 0000 0000 0001.