feat(api): add signed payment authorization (SPA) flow#29

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feat/signed-payment-authorization

Mar 8, 2026

Commits on Mar 8, 2026

feat(api): add signed payment authorization issuance and verification

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chore(api): drop placeholder SPA doc file from code PR

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docs(api): add signed payment authorization specification

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fix(api): harden SPA verification semantics and error taxonomy

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