Audit-Proof Double-Entry Reconciliation & Webhook Pipeline
Bottleneck & Risk Diagnosis
High-growth European B2B platforms lose 15+ finance hours weekly reconciling asynchronous Stripe payouts and SEPA bank statements because webhook retries, partial FX deductions, and missing remittance references corrupt naive CRUD tables.
Engineered Solution Overview
An HMAC-verified webhook ingestion gateway paired with Redis idempotency locks and an immutable PostgreSQL 16 double-entry ledger. Exact matches settle automatically in under 25ms, while FX/fee tolerances route cleanly into an operator exception queue.
Recommended Production Tech Stack
Selected for deterministic reliability, strict type safety, and low cloud overheadHMAC + Redis Idempotency
Cryptographic signature verification and 72-hour idempotency keys prevent duplicate ledger postings during upstream webhook storms.
Immutable Double-Entry Ledger
PostgreSQL append-only journal entries enforce balanced debit/credit constraints with row-level locking on virtual IBAN accounts.
Dead-Letter Replay Inspector
Failed downstream ERP syncs enter an exponential-backoff Dead Letter Queue with one-click operator payload replay.
System Dataflow & Topology (Mermaid.js)
End-to-end request lifecycle, persistence boundaries, and asynchronous workersRendering system topology...
Sardana Webhook Relay & Inventory VAT ERP
Live HMAC-SHA256 webhook ingestion engine + EU Peppol e-invoicing ledger already running in production.