Service layer is the middle layer between the presentation and business layers. It abstracts the actual logic implemented on the business layer from the presentation layer and exposes services that can be consumed by the presentation layer. This layer should be secure enough to allow only authorized access to the resources.

We will develop the service layer using the ASP.NET Core Web application and use Web API to expose services. This layer will reference the business and common layers defined previously.

Let's create a new ASP.NET Core Web Application (.NET Core) project and name it EA.TMS.ServiceApp: