Replace the illustrative UCP-shaped checkout document with artifacts validated against a released UCP schema. Preserve the authority, policy decision, runtime evidence, and receipt bindings. Acceptance evidence: schema validation; signed protocol artifact where the release supports it; overspend, merchant substitution, stale digest, and replay negative cases; explicit remaining trust boundaries.
Replace the illustrative UCP-shaped checkout document with artifacts validated against a released UCP schema. Preserve the authority, policy decision, runtime evidence, and receipt bindings. Acceptance evidence: schema validation; signed protocol artifact where the release supports it; overspend, merchant substitution, stale digest, and replay negative cases; explicit remaining trust boundaries.