Ramp is taking aim at American Express by upending corporate credit cards. Can the $22.5 billion startup live up to the hype?

But then Lee got a call from Karim Atiyeh, his former boss at a tiny fintech startup called Paribus, where he had interned for a month as a freshman.
Paribus had been acquired by Capital One, and Atiyeh and his cofounder, Eric Glyman, had been workin… [22696 chars]