[Icelander]

If the dragon lady and her followers are fantastically rich and, as a dragon, she is supernaturally skilful in growing her hoard*, I don't see how she couldn't have founded a perfectly legitimate credit card company that competes with VISA, AMEX, MasterCard, etc.

She'll make money on all the millions of ordinary customers who aren't aware of her dragonic nature and she can conceal the activities of her secret credit-card having operatives through cunning financial acumen.

Of course, this all depends on her having supernatural cunning and financial acumen, the sort that allows her to break into a market with fantastically high entry costs and advantage for established market leaders, and then conceal financial irregularities while having to conform to very strict regulations.

*As she should be.