Fix return types for Taxrate controllers and remove unused classes for Payment controller.

app/Http/Controllers/TaxrateController.php

@@ -3,13 +3,14 @@
 namespace App\Http\Controllers;
 
 use App\Models\Taxrate;
+use Illuminate\Contracts\View\View;
 
 class TaxrateController extends Controller
 {
     /**
      * Display a listing of the resource.
      */
-    public function index()
+    public function index(): View
     {
         return view('taxrate.index');
     }
@@ -17,7 +18,7 @@ class TaxrateController extends Controller
     /**
      * Show the form for creating a new resource.
      */
-    public function create()
+    public function create(): View
     {
         return view('taxrate.create');
     }
@@ -25,7 +26,7 @@ class TaxrateController extends Controller
     /**
      * Show the form for editing the specified resource.
      */
-    public function edit(Taxrate $taxrate)
+    public function edit(Taxrate $taxrate): View
     {
         return view('taxrate.edit', ['taxrate' => $taxrate]);
     }