Building a Highly Concurrent Webhook Processing Pipeline: Lessons from the Synapse Reconciliation Engine

Short summary

Production webhook pipelines for financial systems must enforce idempotency at the ingress boundary using atomic operations (Redis SET NX) before triggering downstream processing, validate payloads with strict schema validation, and use fixed-point arithmetic (Python Decimal) instead of floats to prevent rounding errors in ledgers. The Synapse Reconciliation Engine bridges M-Pesa and Kenya Revenue Authority systems using these patterns to handle duplicate deliveries, malformed phone numbers, and precision issues at scale.

• •Enforce idempotency at ingress boundary with Redis SET NX before downstream I/O
• •Use strict schema validation (Pydantic v2) to reject malformed payloads before they corrupt data
• •Handle financial precision with Decimal, not float; normalize phone numbers with pre-compiled regex

Generated with AI, which can make mistakes.