ASP.NET Core 2.1 now supports Webhooks. This is a sample application based on ASP.NET Core 2.1 preview 1 and contains code for Dropbox and GitHub webhooks integration with ASP.NET Core 2.1. Find more details on the following link.
http://www.talkingdotnet.com/webhooks-with-asp-net-core-dropbox-and-github/