The first version of a stablecoin checkout often looks perfectly reasonable. You support USDT, so you define the networks your application accepts: const supportedNetworks = { USDT : [ " Ethereum " , " Tron " , " BSC " ] }; The frontend uses that list to populate a selector, the backend uses the selected value to create a payment, and everything works. Until the assumptions behind that array stop being true. A network may be added or remo...