Webhook Security and Verification
Full guide to documenting webhook security verification methods in NeoArc Studio. Covers HMAC-SHA256 signatures, asymmetric key verification, shared secrets, mutual TLS, bearer tokens, basic authentication, and security-related decision documentation.
Webhook security verification is the most critical element of any webhook integration. Without proper verification, consumers cannot distinguish legitimate deliveries from malicious payloads. NeoArc Studio supports documenting multiple verification methods that cover the full spectrum of webhook security patterns, from HMAC signatures used by Stripe and GitHub to mutual TLS used in financial services.
Verification Method Comparison
The table below summarises the available verification methods, their security strength, and appropriate usage scenarios.
| Method | Security Level | Key Management | Best For |
|---|---|---|---|
| HMAC | High | Shared secret per endpoint | General-purpose webhooks (Stripe, GitHub, Shopify) |
| Asymmetric | Very High | Provider publishes public key | High-security integrations (Twilio, Svix) |
| Shared Secret | Medium | Static token per endpoint | Simple internal integrations |
| Mutual TLS | Very High | Client and server certificates | Enterprise and financial APIs |
| Bearer Token | Medium | Pre-shared OAuth token | Simple SaaS integrations |
| Basic Auth | Low | Username and password per endpoint | Legacy system compatibility |
| None | None | No credentials required | Development and testing only |
HMAC Signature Verification
HMAC (Hash-based Message Authentication Code) is the most widely adopted webhook verification method. The provider computes a hash of the request body using a shared secret and includes the result in a header. The consumer recomputes the hash and compares it against the header value.
Asymmetric Key Verification
With asymmetric verification, the provider signs the payload with a private key and the consumer verifies using the provider's public key. This eliminates the need for shared secrets and is suitable for scenarios where secret distribution is impractical.
Shared Secret Verification
Shared secret verification sends a static token in a header with every delivery. The consumer checks that the header value matches the expected secret. This is simpler than HMAC but provides weaker security because the secret is transmitted with every request.
Mutual TLS (mTLS)
Mutual TLS verification requires both the provider and consumer to present valid certificates during the TLS handshake. This provides transport-level authentication and encryption but requires certificate management infrastructure on both sides.
Bearer Token and Basic Auth
Bearer token and basic authentication are simpler verification methods suitable for lower-security scenarios or legacy system compatibility.
| Aspect | Bearer Token | Basic Auth |
|---|---|---|
| Header | Authorization: Bearer {token} | Authorization: Basic {base64(user:pass)} |
| Secret Management | Single pre-shared token | Username and password pair |
| Token Rotation | Replace token via API or portal | Update credentials via API or portal |
| Payload Integrity | No (verifies sender, not payload) | No (verifies sender, not payload) |
| Transport Security | Requires HTTPS | Requires HTTPS |
| Appropriate For | Simple SaaS integrations, internal services | Legacy systems, backward compatibility |
No Verification
The "None" verification type explicitly documents that the webhook API does not include any sender verification. This is acceptable only for development and testing environments.
Secret Management Best Practices
Regardless of verification method, document how secrets and credentials are managed throughout their lifecycle.
Replay Attack Prevention
Some webhook implementations include timestamp-based replay protection alongside signature verification.
Documenting Security in NeoArc
The webhook API editor provides dedicated fields for all security configuration. Here is how each verification method maps to the editor's security section.