diff --git a/src/BindingHelpers.cs b/src/BindingHelpers.cs
deleted file mode 100644
index 2deeebf81b36..000000000000
--- a/src/BindingHelpers.cs
+++ /dev/null
@@ -1,54 +0,0 @@
-#nullable enable
-
-namespace BindingHelpers
-{
-	internal static class BindingHelpers {
-		// this method is helpful for the getter for something like:
-		// unsafe PMPrinter* PMPrinter { get; }
-		//
-		// we can change this to:
-		// [Internal]
-		// [Export ("PMPrinter")]
-		// IntPtr _GetPMPrinter ();
-		//
-		// and then add this to the manual file:
-		// public PMPrinter? PMPrinter {
-		//    get => BindingHelpers.GetPtrToStruct<PMPrinter> (_GetPMPrinter ());
-		// }
-		public static T? GetPtrToStruct<T> (IntPtr intPtr) where T : struct
-		{
-			if (intPtr == IntPtr.Zero)
-				return null;
-			return Marshal.PtrToStructure<T> (intPtr);
-		}
-
-		// this method is helpful for the setter for something like:
-		// unsafe MPSScaleTransform* ScaleTransform { get; set; }
-		//
-		// we can change this to:
-		// [Export ("setScaleTransform:")]
-		// [Internal]
-		// void _SetScaleTransform (IntPtr value);
-		//
-		// and then add this to the manual file:
-		// public MPSScaleTransform? ScaleTransform {
-		//    ...
-		//    set => BindingHelpers.SetPtrToStruct<MPSScaleTransform> (value, (ptr) => _SetScaleTransform (ptr));
-		// }
-		public static void SetPtrToStruct<T> (object? value, Action<IntPtr> setAction) where T : struct
-		{
-			if (value.HasValue) {
-				var size_of_scale_transform = Marshal.SizeOf<T> ();
-				IntPtr ptr = Marshal.AllocHGlobal (size_of_scale_transform);
-				try {
-					Marshal.StructureToPtr<T> (value.Value, ptr, false);
-					setAction (ptr);
-				} finally {
-					Marshal.FreeHGlobal (ptr);
-				}
-			} else {
-				setAction (IntPtr.Zero);
-			}
-		}
-	}
-}
\ No newline at end of file
diff --git a/src/PrintCore/PDEPlugInCallbackProtocol.cs b/src/PrintCore/PDEPlugInCallbackProtocol.cs
index 72899a7b290c..22ec5d44b1ce 100644
--- a/src/PrintCore/PDEPlugInCallbackProtocol.cs
+++ b/src/PrintCore/PDEPlugInCallbackProtocol.cs
@@ -6,33 +6,113 @@
 using System.Runtime.InteropServices;
 using Foundation;
 using ObjCRuntime;
-// TODO add reference to BindingHelpers
-using BindingHelpers;
+using ppd_file_s = System.IntPtr;
+
+#if !NET
+using NativeHandle = System.IntPtr;
+#endif
 
 namespace PrintCore {
 
 	public partial class PDEPlugInCallbackProtocol {
 
+#if NET
+		[SupportedOSPlatform ("macos13.0")]
+		[UnsupportedOSPlatform ("ios")]
+		[UnsupportedOSPlatform ("maccatalyst")]
+		[UnsupportedOSPlatform ("tvos")]
+#endif
 		public PMPrintSession? PrintSession {
-			get => BindingHelpers.GetPtrToStruct<PMPrintSession> (_GetPrintSession ());
+			get => GetPtrToStruct<PMPrintSession> (_GetPrintSession ());
 		}
 
+#if NET
+		[SupportedOSPlatform ("macos13.0")]
+		[UnsupportedOSPlatform ("ios")]
+		[UnsupportedOSPlatform ("maccatalyst")]
+		[UnsupportedOSPlatform ("tvos")]
+#endif
 		public PMPrintSession? PrintSettings {
-			get => BindingHelpers.GetPtrToStruct<PMPrintSession> (_GetPrintSettings ());
+			get => GetPtrToStruct<PMPrintSession> (_GetPrintSettings ());
 		}
-		
+
+#if NET
+		[SupportedOSPlatform ("macos13.0")]
+		[UnsupportedOSPlatform ("ios")]
+		[UnsupportedOSPlatform ("maccatalyst")]
+		[UnsupportedOSPlatform ("tvos")]
+#endif
 		public PMPageFormat? PageFormat {
-			get => BindingHelpers.GetPtrToStruct<PMPageFormat> (_GetPageFormat ());
+			get => GetPtrToStruct<PMPageFormat> (_GetPageFormat ());
 		}
-		
+
+#if NET
+		[SupportedOSPlatform ("macos13.0")]
+		[UnsupportedOSPlatform ("ios")]
+		[UnsupportedOSPlatform ("maccatalyst")]
+		[UnsupportedOSPlatform ("tvos")]
+#endif
 		public PMPrinter? PMPrinter {
-			get => BindingHelpers.GetPtrToStruct<PMPrinter> (_GetPMPrinter ());
+			get => GetPtrToStruct<PMPrinter> (_GetPMPrinter ());
 		}
-		
-		// TODO Figure out how to make the ppd_file_s: https://gist.github.com/tj-devel709/ef051c6750fb304d826f58059d2c1acd#file-ppd-h-L286
-		// public ppd_file_s? PpdFile {
-		// 	get => BindingHelpers.GetPtrToStruct<ppd_file_s> (_GetPpdFile ());
+
+#if NET
+		[SupportedOSPlatform ("macos13.0")]
+		[UnsupportedOSPlatform ("ios")]
+		[UnsupportedOSPlatform ("maccatalyst")]
+		[UnsupportedOSPlatform ("tvos")]
+#endif
+		public ppd_file_s? PpdFile {
+			get => _GetPpdFile ();
+		}
+
+		// this method is helpful for the getter for something like:
+		// unsafe PMPrinter* PMPrinter { get; }
+		//
+		// we can change this to:
+		// [Internal]
+		// [Export ("PMPrinter")]
+		// IntPtr _GetPMPrinter ();
+		//
+		// and then add this to the manual file:
+		// public PMPrinter? PMPrinter {
+		//    get => BindingHelpers.GetPtrToStruct<PMPrinter> (_GetPMPrinter ());
 		// }
+		internal static T? GetPtrToStruct<T> (IntPtr intPtr) where T : struct
+		{
+			if (intPtr == IntPtr.Zero)
+				return null;
+			return Marshal.PtrToStructure<T> (intPtr);
+		}
+
+		// this method is helpful for the setter for something like:
+		// unsafe MPSScaleTransform* ScaleTransform { get; set; }
+		//
+		// we can change this to:
+		// [Export ("setScaleTransform:")]
+		// [Internal]
+		// void _SetScaleTransform (IntPtr value);
+		//
+		// and then add this to the manual file:
+		// public MPSScaleTransform? ScaleTransform {
+		//    ...
+		//    set => BindingHelpers.SetPtrToStruct<MPSScaleTransform> (value, (ptr) => _SetScaleTransform (ptr));
+		// }
+		internal static void SetPtrToStruct<T> (T? value, Action<IntPtr> setAction) where T : struct
+		{
+			if (value.HasValue) {
+				var size_of_scale_transform = Marshal.SizeOf<T> ();
+				IntPtr ptr = Marshal.AllocHGlobal (size_of_scale_transform);
+				try {
+					Marshal.StructureToPtr<T> (value.Value, ptr, false);
+					setAction (ptr);
+				} finally {
+					Marshal.FreeHGlobal (ptr);
+				}
+			} else {
+				setAction (IntPtr.Zero);
+			}
+		}
 	}
 }
 
diff --git a/src/printcore.cs b/src/printcore.cs
index 06e4d6561086..0219b1b5679e 100644
--- a/src/printcore.cs
+++ b/src/printcore.cs
@@ -16,7 +16,7 @@
 
 namespace PrintCore {
 
-	[Mac (14,0)]
+	[Mac (13,0)]
 	[Protocol]
 	[BaseType (typeof (NSObject))]
 	interface PDEPanel
@@ -70,7 +70,7 @@ interface PDEPanel
 		void PrintWindowWillClose (bool userCanceled);
 	}
 
-	[Mac (14,0)]
+	[Mac (13,0)]
 	[Protocol]
 	[BaseType (typeof (NSObject))]
 	interface PDEPlugIn
@@ -86,7 +86,7 @@ interface PDEPlugIn
 
 	interface IPDEPlugInCallbackProtocol { }
 
-	[Mac (14,0)]
+	[Mac (13,0)]
 	[Protocol]
 	interface PDEPlugInCallbackProtocol
 	{