installed DomPDF

composer.json

@@ -6,6 +6,7 @@
     "type": "project",
     "require": {
         "php": "^7.1.3",
+        "barryvdh/laravel-dompdf": "^0.8.6",
         "doctrine/dbal": "^2.7",
         "fideloper/proxy": "^4.0",
         "intervention/image": "^2.4",

config/app.php

@@ -169,7 +169,9 @@ return [
         App\Providers\EventServiceProvider::class,
         App\Providers\RouteServiceProvider::class,
 
-        Tymon\JWTAuth\Providers\LaravelServiceProvider::class
+        Tymon\JWTAuth\Providers\LaravelServiceProvider::class,
+
+        Barryvdh\DomPDF\ServiceProvider::class
     ],
 
     /*
@@ -222,6 +224,7 @@ return [
         'Entrust'   => Zizaco\Entrust\EntrustFacade::class,
         'JWTAuth' => Tymon\JWTAuth\Facades\JWTAuth::class,
         'JWTFactory' => Tymon\JWTAuth\Facades\JWTFactory::class,
+        'PDF' => Barryvdh\DomPDF\Facade::class
 
     ],