Send invoices by email.

app/Http/Controllers/InvoiceController.php

@@ -3,14 +3,14 @@
 namespace App\Http\Controllers;
 
 use App\Models\Invoice;
-use Illuminate\Http\Request;
+use Illuminate\Contracts\View\View;
 
 class InvoiceController extends Controller
 {
     /**
      * Display a listing of the resource.
      */
-    public function index()
+    public function index(): View
     {
         return view('invoice.index');
     }
@@ -18,7 +18,7 @@ class InvoiceController extends Controller
     /**
      * Show the form for creating a new resource.
      */
-    public function create()
+    public function create(): View
     {
         return view('invoice.create');
     }
@@ -26,7 +26,7 @@ class InvoiceController extends Controller
     /**
      * Display the specified resource.
      */
-    public function show(Invoice $invoice)
+    public function show(Invoice $invoice): View
     {
         return view('invoice.show', ['invoice' => $invoice]);
     }
@@ -38,4 +38,14 @@ class InvoiceController extends Controller
     {
         //
     }
+
+    /**
+     * Show the form for sending the specified invoice.
+     */
+    public function mail(int $id): View
+    {
+        $invoice = Invoice::find($id);
+
+        return view('invoice.mail', ['invoice' => $invoice]);
+    }
 }