diff --git a/src/Ploi/Resources/App.php b/src/Ploi/Resources/App.php
index a39d12c..9eb1187 100644
--- a/src/Ploi/Resources/App.php
+++ b/src/Ploi/Resources/App.php
@@ -4,6 +4,7 @@
 namespace Ploi\Resources;
 
 use Ploi\Exceptions\Http\NotValid;
+use Ploi\Http\Response;
 use stdClass;
 
 class App extends Resource
@@ -29,7 +30,7 @@ public function buildEndpoint(): self
         return $this;
     }
 
-    public function get(?int $id = null)
+    public function get(?int $id = null): Response
     {
         if ($id) {
             $this->setId($id);
diff --git a/src/Ploi/Resources/Database.php b/src/Ploi/Resources/Database.php
index 5a925db..4aa21b4 100644
--- a/src/Ploi/Resources/Database.php
+++ b/src/Ploi/Resources/Database.php
@@ -48,7 +48,7 @@ public function get(?int $id = null): Response
             : $this->getPloi()->makeAPICall($this->getEndpoint()); 
     }
 
-    public function create(string $name, string $user, string $password, $description = null, $siteId = null): Response
+    public function create(string $name, string $user, string $password, ?string $description = null, ?int $siteId = null): Response
     {
         // Remove the id
         $this->setId(null);
@@ -139,9 +139,9 @@ public function duplicate(string $name, ?string $user = null, ?string $password
         return $this->getPloi()->makeAPICall($this->getEndpoint() . '/duplicate', 'post', $options);
     }
 
-    public function backups($id = null): DatabaseBackup
+    public function backups(?int $id = null): DatabaseBackup
     {
-        return new DatabaseBackup($this->getServer(),$this,$id);
+        return new DatabaseBackup($this->getServer(), $this, $id);
     }
 
     public function users(?int $id = null): DatabaseUser
diff --git a/src/Ploi/Resources/FileBackup.php b/src/Ploi/Resources/FileBackup.php
index eb82a88..17b0768 100644
--- a/src/Ploi/Resources/FileBackup.php
+++ b/src/Ploi/Resources/FileBackup.php
@@ -10,7 +10,7 @@ class FileBackup extends Resource
 {
     use HasPagination;
 
-    public function __construct(\Ploi\Ploi $ploi, int $id = null)
+    public function __construct(\Ploi\Ploi $ploi, ?int $id = null)
     {
         parent::__construct($ploi, $id);
 
@@ -38,7 +38,7 @@ public function buildEndpoint(): self
      * @param int|null $id
      * @return Response
      */
-    public function get(int $id = null): Response
+    public function get(?int $id = null): Response
     {
         if ($id) {
             $this->setId($id);
@@ -72,12 +72,12 @@ public function create(
         array $sites,
         int $interval,
         array $path,
-        string $locations = null,
-        int $keep_backup_amount = null,
-        string $custom_name = null,
-        string $password = null,
-        ?bool $deleteOnFail = null
-    ): Response {
+          ?string $locations = null,
+          ?int $keep_backup_amount = null,
+          ?string $custom_name = null,
+          ?string $password = null,
+          ?bool $deleteOnFail = null
+      ): Response {
         // Remove the id
         $this->setId(null);
 
@@ -109,7 +109,7 @@ public function create(
      * @param int|null $id
      * @return Response
      */
-    public function run(int $id = null): Response
+    public function run(?int $id = null): Response
     {
         $this->setIdOrFail($id);
 
@@ -125,7 +125,7 @@ public function run(int $id = null): Response
      * @param int|null $id
      * @return Response
      */
-    public function delete(int $id = null): Response
+    public function delete(?int $id = null): Response
     {
         $this->setIdOrFail($id);
 
diff --git a/src/Ploi/Resources/Opcache.php b/src/Ploi/Resources/Opcache.php
index 5f2542f..56b7cbd 100644
--- a/src/Ploi/Resources/Opcache.php
+++ b/src/Ploi/Resources/Opcache.php
@@ -3,6 +3,8 @@
 
 namespace Ploi\Resources;
 
+use Ploi\Http\Response;
+
 class Opcache extends Resource
 {
     public function __construct(Server $server, ?int $id = null)
@@ -25,21 +27,21 @@ public function buildEndpoint(): self
         return $this;
     }
 
-    public function refresh()
+    public function refresh(): Response
     {
         $this->setEndpoint($this->getEndpoint() . '/refresh-opcache');
 
         return $this->getPloi()->makeAPICall($this->getEndpoint(), 'post');
     }
 
-    public function enable()
+    public function enable(): Response
     {
         $this->setEndpoint($this->getEndpoint() . '/enable-opcache');
 
         return $this->getPloi()->makeAPICall($this->getEndpoint(), 'post');
     }
 
-    public function disable()
+    public function disable(): Response
     {
         $this->setEndpoint($this->getEndpoint() . '/disable-opcache');
 
diff --git a/src/Ploi/Resources/Server.php b/src/Ploi/Resources/Server.php
index 66acf85..5934ed5 100644
--- a/src/Ploi/Resources/Server.php
+++ b/src/Ploi/Resources/Server.php
@@ -223,7 +223,7 @@ public function monitoring(?int $id = null): Response
         return $this->callApi('monitor');
     }
 
-    public function sites($id = null): Site
+    public function sites(?int $id = null): Site
     {
         return new Site($this, $id);
     }
diff --git a/src/Ploi/Resources/Site.php b/src/Ploi/Resources/Site.php
index 05bc170..82e1e71 100644
--- a/src/Ploi/Resources/Site.php
+++ b/src/Ploi/Resources/Site.php
@@ -28,7 +28,7 @@ public function __construct(Server $server, ?int $id = null)
         $this->buildEndpoint();
     }
 
-    public function get(?int $id = null)
+    public function get(?int $id = null): Response
     {
         if ($id) {
             $this->setId($id);
@@ -271,12 +271,12 @@ public function resetPermissions(?int $id = null): Response
         return $this->getPloi()->makeAPICall($this->getEndpoint() . '/permission-reset', 'post');
     }
 
-    public function redirects($id = null): Redirect
+    public function redirects(?int $id = null): Redirect
     {
         return new Redirect($this->getServer(), $this, $id);
     }
 
-    public function certificates($id = null): Certificate
+    public function certificates(?int $id = null): Certificate
     {
         return new Certificate($this->getServer(), $this, $id);
     }
@@ -286,7 +286,7 @@ public function repository(): Repository
         return new Repository($this->getServer(), $this);
     }
 
-    public function queues($id = null): Queue
+    public function queues(?int $id = null): Queue
     {
         return new Queue($this->getServer(), $this, $id);
     }
@@ -296,7 +296,7 @@ public function deployment(): Deployment
         return new Deployment($this->getServer(), $this);
     }
 
-    public function app($id = null): App
+    public function app(?int $id = null): App
     {
         return new App($this->getServer(), $this, $id);
     }
diff --git a/src/Ploi/Resources/Synchronize.php b/src/Ploi/Resources/Synchronize.php
index 2f7b164..1b034a7 100644
--- a/src/Ploi/Resources/Synchronize.php
+++ b/src/Ploi/Resources/Synchronize.php
@@ -3,6 +3,7 @@
 
 namespace Ploi\Resources;
 
+use Ploi\Http\Response;
 use Ploi\Ploi;
 
 class Synchronize extends Resource
@@ -16,7 +17,7 @@ public function __construct(?Ploi $ploi = null, ?int $id = null)
         $this->setEndpoint($this->endpoint);
     }
 
-    public function servers()
+    public function servers(): Response
     {
         return $this->getPloi()->makeAPICall($this->getEndpoint() . '/servers');
     }