Developer details five critical pitfalls when handling signed webhooks for e-signatures

A developer outlines common security and reliability mistakes when processing HMAC-signed webhook notifications. He explains that verifying a request requires checking the sender's identity, data integrity, and preventing duplicate processing. The article warns that mishandling JSON parsing can invalidate cryptographic signatures and that timestamps must be checked to prevent replay attacks. It also emphasizes the need for durable deduplication of event IDs and waiting for final completion events, not just individual actions, in multi-signer workflows.