KayeeNL

  public class RegisterWebApiRoute
    {
        public void Process(PipelineArgs args)
        {

            var config = GlobalConfiguration.Configuration;
            config.Routes.MapHttpRoute("DefaultApiRoute",
                                     "MikeAPI/{controller}/{action}/{id}",
                                     new { id = RouteParameter.Optional });

KayeeNL

<?xml version="1.0"?>
<configuration xmlns:patch="http://www.sitecore.net/xmlconfig/">
  <sitecore>
    <api>
      <services>
        <configuration type="Sitecore.Services.Infrastructure.Configuration.ServicesConfiguration, Sitecore.Services.Infrastructure">
          <allowedControllers hint="list:AddController">
            <allowedController desc="WallpaperController">MikeRobbins.WallpaperManager.Controllers.WallpaperController, MikeRobbins.WallpaperManager</allowedController>
          </allowedControllers>