"The next phase of ISO 20022 is not about supporting a new message format. It is about capturing, governing and acting on structured payment data across customer channels, operations, fraud controls, compliance workflows, and downstream systems. The Bank of England’s policy statement on CHAPS makes that clear. From November 2027, Purpose Codes will become mandatory for CHAPS payments submitted through channels under the direct control of direct participants, building on the requirements already introduced in 2025."