Today, I'd like to show you how you can leverage the "Webhooks" feature of Secutils.dev to explore third-party web services, or as a security researcher would say, perform a basic active reconnaissance. Reconnaissance is just a fancy word for gathering information about a target system to identify exploitable vulnerabilities and potential attack vectors. In this post, we'll focus on learning how a specific web service implements functionality that interests us. Our intention is purely innocent — we simply want to understand how it works. However, the technique we'll use is quite similar to what security researchers employ during routine reconnaissance.