Correct, idempotent, concurrency-safe double-entry ledger with ISO 20022 payment processing (pain.001 → pacs.008 → pacs.002) and a reconciliation engine. Proves exactly-once under duplicate/concurrent payments.
golang reconciliation fault-tolerance concurrency payments fintech sepa cockroachdb product-management iso20022 idempotency idempotency-key faster-payment fednow double-entry-ledger
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Updated
Jun 28, 2026 - Makefile