diff --git a/Interfaces/GSD/Model/GSDCostCenter.php b/Interfaces/GSD/Model/GSDCostCenter.php
index fd24e2a..a2417c7 100644
--- a/Interfaces/GSD/Model/GSDCostCenter.php
+++ b/Interfaces/GSD/Model/GSDCostCenter.php
@@ -89,7 +89,7 @@ final class GSDCostCenter implements \JsonSerializable
     /**
      * Get created by
      *
-     * @return mixed
+     * @return int|\phpOMS\Account\Account
      *
      * @since  1.0.0
      */
diff --git a/Interfaces/GSD/Model/GSDCostObject.php b/Interfaces/GSD/Model/GSDCostObject.php
index b5d8beb..7aa2f78 100644
--- a/Interfaces/GSD/Model/GSDCostObject.php
+++ b/Interfaces/GSD/Model/GSDCostObject.php
@@ -89,7 +89,7 @@ final class GSDCostObject implements \JsonSerializable
     /**
      * Get created by
      *
-     * @return mixed
+     * @return int|\phpOMS\Account\Account
      *
      * @since  1.0.0
      */
diff --git a/Models/InterfaceManager.php b/Models/InterfaceManager.php
index 87e2af7..b8cf094 100644
--- a/Models/InterfaceManager.php
+++ b/Models/InterfaceManager.php
@@ -32,7 +32,7 @@ class InterfaceManager
     /**
      * Interface ID.
      *
-     * @var int
+     * @var int
      * @since 1.0.0
      */
     private $id = 0;
@@ -40,7 +40,7 @@ class InterfaceManager
     /**
      * File path.
      *
-     * @var string
+     * @var string
      * @since 1.0.0
      */
     private $path = '';
@@ -48,7 +48,7 @@ class InterfaceManager
     /**
      * Info data.
      *
-     * @var array<string, mixed>
+     * @var array<string, mixed>
      * @since 1.0.0
      */
     private $info = [];
@@ -56,7 +56,7 @@ class InterfaceManager
     /**
      * Object constructor.
      *
-     * @param string $path Info file path
+     * @param string $path Info file path
      *
      * @since  1.0.0
      */
@@ -68,7 +68,7 @@ class InterfaceManager
     /**
      * Get id
      *
-     * @return string
+     * @return string
      *
      * @since  1.0.0
      */
@@ -80,7 +80,7 @@ class InterfaceManager
     /**
      * Get info path
      *
-     * @return string
+     * @return string
      *
      * @since  1.0.0
      */
@@ -92,7 +92,7 @@ class InterfaceManager
     /**
      * Get info path
      *
-     * @return string
+     * @return string
      *
      * @since  1.0.0
      */
@@ -104,7 +104,7 @@ class InterfaceManager
     /**
      * Get info name
      *
-     * @return string
+     * @return string
      *
      * @since  1.0.0
      */
@@ -116,7 +116,7 @@ class InterfaceManager
     /**
      * Provides import interface
      *
-     * @return string
+     * @return string
      *
      * @since  1.0.0
      */
@@ -128,7 +128,7 @@ class InterfaceManager
     /**
      * Provides export interface
      *
-     * @return string
+     * @return string
      *
      * @since  1.0.0
      */
@@ -140,9 +140,9 @@ class InterfaceManager
     /**
      * Load info data from path.
      *
-     * @return void
+     * @return void
      *
-     * @throws PathException This exception is thrown in case the info file path doesn't exist.
+     * @throws PathException This exception is thrown in case the info file path doesn't exist.
      *
      * @since  1.0.0
      */
@@ -152,13 +152,13 @@ class InterfaceManager
             throw new PathException($this->path);
         }
 
-        $this->info = \json_decode(file_get_contents($this->path), true);
+        $this->info = \json_decode(\file_get_contents($this->path), true);
     }
 
     /**
      * Update info file
      *
-     * @return void
+     * @return void
      *
      * @since  1.0.0
      */
@@ -174,18 +174,18 @@ class InterfaceManager
     /**
      * Set data
      *
-     * @param string $path  Value path
-     * @param mixed  $data  Scalar or array of data to set
-     * @param string $delim Delimiter of path
+     * @param string $path  Value path
+     * @param mixed  $data  Scalar or array of data to set
+     * @param string $delim Delimiter of path
      *
-     * @return void
+     * @return void
      *
      * @since  1.0.0
      */
     public function set(string $path, $data, string $delim = '/') : void
     {
-        if (!is_scalar($data) && !is_array($data) && !($data instanceof \JsonSerializable)) {
-            throw new \InvalidArgumentException('Type of $data "' . gettype($data) . '" is not supported.');
+        if (!\is_scalar($data) && !\is_array($data) && !($data instanceof \JsonSerializable)) {
+            throw new \InvalidArgumentException('Type of $data "' . \gettype($data) . '" is not supported.');
         }
 
         ArrayUtils::setArray($path, $this->info, $data, $delim, true);
@@ -194,7 +194,7 @@ class InterfaceManager
     /**
      * Get info data.
      *
-     * @return array<string, mixed>
+     * @return array<string, mixed>
      *
      * @since  1.0.0
      */