Why mTLS is Not Recommended for Webhook Authentication

The use of mutual TLS authentication (mTLS) for webhook authentication is not recommended due to its complexity, compatibility issues, and scalability concerns. It can lead to additional security measures being required, such as client certificates per customer, which can be vulnerable to manipulation. In contrast, webhook signatures offer a simpler, more compatible, and scalable alternative that can help ensure the integrity and authenticity of webhook payloads without the headaches associated with mTLS.