Guide
Validating webhook signatures in ASP.NET Core
The raw-body trap that breaks HMAC verification in .NET, why == is a vulnerability, and how three real providers sign — including one that does not.
Integration guides
The parts the vendor docs leave out.
How these APIs behave once you leave the sandbox — auth flows, webhooks, idempotency, and the failure modes the vendor docs skip. Every guide ships runnable .NET code.