Episerver Commerce CustomerContact Events - Quan Mai's blog (vimvq1987.com)

this is probably what you need 

Hi Quan Mai, 

This might be a stupid question, but where should Configs\baf.data.manager.config be located? Is this some old configuration from Commerce 13? 

The settings were moved to Mediachase.BusinessFoundation.Data.Business.Configuration.BusinessManagerOptions (optimizely.com) 

so they are now part of appSettings.json (and in JSON format of course). you can also add one like this

            services.Configure<BusinessManagerOptions>(options =>
            {
                options.Plugins.Add(
                    new RequestPlugin()
                    {
                        MetaClass = "List",
                        Method = "CustomPage",
                        EventStage = EventPipeLineStage.PostMainOperationInsideTranasaction,
                        TypeName = "Mediachase.Commerce.Customization.Plugins.CustomPageNormalizationPlugin, Mediachase.Commerce"
                    });
            });

Hi Quan Mai,

Thanks for the info. Could you clarify how we would implement this? I expect that we create a class like public class CustomerContactHandler : IPlugin from your blog. But how do we configure commerce to use the CustomerContactHandler? Is it the MetaClass or Method or TypeName fields in the RequestPlugin? I can't figure out what the values are supposed to be of those. 

I appreciate your guidance on how to set this up.

metaclass = the class you want to listen, in this case, Contact

Method = the method you want to listen to, usually List, Delete 

And is typename = the namespace of the class implementing IPlugin or what is the supposed value here?