hubspot-webhook-handlers

Build and harden HubSpot v3 webhook handlers that survive production: HMAC-SHA256 signature verification, Redis SET NX deduplication, async batch processing with immediate 200 ACK, dead-letter queuing for permanent failures, and event-ordering guards for property-change streams. Use when implementing HubSpot webhooks for the first time, hardening an existing handler against retry storms or duplicate processing, debugging signature verification failures, or designing a reliable event pipeline for contact, company, or deal change events. Trigger with "hubspot webhook", "hubspot signature verification", "hubspot webhook dedup", "hubspot webhook retry storm", "hubspot event handler", "hubspot property change webhook", "hubspot list membership webhook", "hubspot dead letter queue".