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…it#612) - generateIdempotencyKey: deterministic SHA-256 hex key from invoiceId, payer, amount - isKnownKey / registerKey / clearKeys: in-memory Set-backed registry - Exported from index.ts alongside existing Deduplicator - Unit tests: determinism, input sensitivity, nonce variation, registry lifecycle Closes Stellar-split#612
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Closes #612
What
Adds a canonical idempotency key generator and an in-memory key registry for payment deduplication.
Changes
generateIdempotencyKey(params)— deterministic SHA-256 hex digest of{invoiceId}:{payer}:{amount}(with optional:{nonce}suffix)isKnownKey(key)/registerKey(key)/clearKeys()— in-memorySet-backed registrysrc/index.tsalongside existingDeduplicatorVerification
test/dedup.test.ts