Key insights: Fintechs and card networks are pursuing B2B payment, creating more options beyond banks.  What's at stake: Up to $13 trillion in transaction value could move to emerging payment rails in the next four years.Forward look: Digital assets such as stablecoins, tokenized deposits and central bank digital currencies are also emerging choices. Companies are looking beyond banks for cross-border transactions, a trend that could continue to accelerate as potentially faster, less expensive alternatives ...