Securing Webhooks from Twilio in PHP` discusses the importance of securing webhooks from Twilio, a service that enables interactions with events such as SMS messages. To protect against counterfeit requests, Twilio includes a signature header `X-Twilio-Signature` in every webhook sent to a server. The Twilio SDK for PHP provides a `RequestValidator` class that can perform a comparison of the request signature, URL, and data to ensure only genuine requests are handled. By using this class and verifying the signature on every endpoint that handles webhooks, developers can protect their applications from manipulation by malicious actors. It is also recommended to turn on TLS and use HTTPS to encrypt requests and prevent man-in-the-middle attacks.