Greenfield: Improve error message, do not use internal lightning node on store's lightning API

BTCPayServer/Filters/JsonHttpExceptionFilter.cs

@@ -0,0 +1,21 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using Microsoft.AspNetCore.Mvc.Filters;
+using Microsoft.AspNetCore.Mvc.Infrastructure;
+
+namespace BTCPayServer.Filters
+{
+    public class JsonHttpExceptionFilter : IExceptionFilter
+    {
+        public void OnException(ExceptionContext context)
+        {
+            if (context.Exception is JsonHttpException ex)
+            {
+                context.Result = ex.ActionResult;
+                context.ExceptionHandled = true;
+            }
+        }
+    }
+}