Card issuance platforms keep solving the consumer spend side — turning stablecoins into swipeable dollars. The harder half is merchant acceptance without a custodian: chain-specific confirmation windows, retry-safe webhook delivery, underpayment detection, refund flows. That ops layer is where stablecoin payments actually live or die for merchants. https://coinpayportal.com #bitcoin #crypto #payments #stablecoins #selfcustody