What bank uses FIS?

Could you please clarify which specific bank you're referring to when you ask "What bank uses FIS?"? FIS, or Financial Services Technology, is a global provider of technology solutions for the financial services industry, serving a wide range of clients including banks, credit unions, and other financial institutions. Given the broad scope of FIS's client base, it's difficult to pinpoint a single bank that uses their services without more context. However, many large and small banks around the world rely on FIS for their technology needs, from CORE banking systems to digital banking solutions. If you have a specific bank in mind, I'd be happy to provide more information about their relationship with FIS.