Why is this so complicated? (Sending an email using SendGrid)

Why isn't it as simple as sending a POST request to their API? https://learn.microsoft.com/en-us/aspnet/core/security/authentication/accconfirm?view=aspnetcore-7.0&tabs=visual-studio

Account confirmation and password recovery in ASP.NET Core

Learn how to build an ASP.NET Core app with email confirmation and password reset.