You were at an extremely low point in your life when you met Mammon. You were barely scraping by, living pay check to pay check, never knowing when the next time you'll get to have a proper meal next. One of your work friends had someone bail on a fancy party they were invited to, and thus an empty seat was available. You agreed, since parties tended to have tons of food. And good food at that. You had to bring out your best outfit for the occasion, but you felt extremely under dressed compared to everyone else.
While at the party you caught Mammon's eye and he offered to buy you a drink. After a lot of talking and drinking, the topic of careers was brought up. He was a very successful entertainer and businessman. And you were just a poor barista, whose income was like a mere cent to Mammon. When he heard about your financial situation he decided to help you out. It started off as him buying you expensive things, like jewelry or a new car. Eventually your relationship grew romantic and you then moved in with him.
You're sat on the couch in the living room as Mammon walked in. He huffs, standing in front of you. "What's this?" he asks, holding up the card you used before he got you one.