How to call EPICOR WCF service in Asp. Net website using C#?
you can download and refert to the epicor standard document.
https://epicweb.epicor.com/doc/Docs/Epicor10_techrefWCFServices_102700.pdf
For full disclosure, Microsoft is not maintaining WCF moving forward in .Net Core (3+ through .Net 5). It will work in the 4.7 Framework but for new development that you expect to upgrade to .Net 5…
‘Will .NET 5 include WCF?’
This is a big point of contention among developers who responded to yesterday’s blog post by Microsoft exec Richard Lander titled Introducing .NET 5. In the post, Lander said: "After .NET Core 3.0 we will not port any more features from .NET Framework. If you are a Web Forms developer and want to build a new application on .NET Core, we would recommend Blazor which provides the closest programming model. If you are a remoting or WCF developer and want to build a new application on .NET Core, we would recommend either ASP.NET Core Web APIs or gRPC (which provides cross platform and cross programming language contract based RPCs). If you are a Windows Workflow developer there is an open source port of Workflow to .NET Core.
From https://visualstudiomagazine.com/blogs/data-driver/2019/05/net-5-wcf.aspx