feat(api): add signed payment authorization (SPA) flow#29
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March 8, 2026 18:15
Introduce a signed payment authorization artifact (Ed25519) generated from policy decisions and verified at settlement time, then return it in exit responses to support portable deterministic agent payments. Made-with: Cursor
Remove empty SIGNED_PAYMENT_AUTHORIZATION.md from the dedicated SPA implementation PR so the change set remains focused on functional code and tests. Made-with: Cursor
Include the restored signed payment authorization design spec in the dedicated SPA pull request so implementation and protocol guidance land together. Made-with: Cursor
Preserve precise authorization failure reasons, enforce keyId/public-key verification boundaries, support deterministic expiry checks, and document digest-signing semantics to keep SPA behavior explicit and replay-safe. Made-with: Cursor
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Summary
Test plan
pnpm --filter api test -- test/services/paymentAuthorization.test.ts test/policy/enforceOrReject.test.ts test/routes/gate.test.tsMade with Cursor