diff --git a/Example/ResponseExample.php b/Example/ResponseExample.php
index 7f797db..7f9d89c 100644
--- a/Example/ResponseExample.php
+++ b/Example/ResponseExample.php
@@ -83,7 +83,7 @@ public function responseExample()
          * Errors array.
          * In case of errors, API will return array detailing which parameters were invalid.
          *
-         * @var array
+         * @var string[]
          */
         $response->getErrors();
 
@@ -91,7 +91,7 @@ public function responseExample()
          * Original curl response.
          * Original, unmodified response from curl request.
          *
-         * @var mixed
+         * @var string
          */
         $response->getCurlResponse();
 
diff --git a/src/Client/Response/AddUserToGroupResponse.php b/src/Client/Response/AddUserToGroupResponse.php
index 7611b74..da76d1c 100644
--- a/src/Client/Response/AddUserToGroupResponse.php
+++ b/src/Client/Response/AddUserToGroupResponse.php
@@ -20,10 +20,7 @@
  */
 class AddUserToGroupResponse extends Response
 {
-    /**
-     * @param mixed $curlResponse
-     */
-    public function __construct($curlResponse)
+    public function __construct(string $curlResponse)
     {
         $this->processCurlResponse($curlResponse);
     }
diff --git a/src/Client/Response/CancelRetryResponse.php b/src/Client/Response/CancelRetryResponse.php
index bdfdc32..7f209c4 100644
--- a/src/Client/Response/CancelRetryResponse.php
+++ b/src/Client/Response/CancelRetryResponse.php
@@ -20,10 +20,7 @@
  */
 class CancelRetryResponse extends Response
 {
-    /**
-     * @param mixed $curlResponse
-     */
-    public function __construct($curlResponse)
+    public function __construct(string $curlResponse)
     {
         $this->processCurlResponse($curlResponse);
     }
diff --git a/src/Client/Response/CreateGroupResponse.php b/src/Client/Response/CreateGroupResponse.php
index caf1358..cb5130f 100644
--- a/src/Client/Response/CreateGroupResponse.php
+++ b/src/Client/Response/CreateGroupResponse.php
@@ -25,10 +25,7 @@ class CreateGroupResponse extends Response
      */
     private string $groupKey;
 
-    /**
-     * @param mixed $curlResponse
-     */
-    public function __construct($curlResponse)
+    public function __construct(string $curlResponse)
     {
         $this->processCurlResponse($curlResponse);
     }
diff --git a/src/Client/Response/DisableUserInGroupResponse.php b/src/Client/Response/DisableUserInGroupResponse.php
index eb025eb..9189b6f 100644
--- a/src/Client/Response/DisableUserInGroupResponse.php
+++ b/src/Client/Response/DisableUserInGroupResponse.php
@@ -20,10 +20,7 @@
  */
 class DisableUserInGroupResponse extends Response
 {
-    /**
-     * @param mixed $curlResponse
-     */
-    public function __construct($curlResponse)
+    public function __construct(string $curlResponse)
     {
         $this->processCurlResponse($curlResponse);
     }
diff --git a/src/Client/Response/EnableUserInGroupResponse.php b/src/Client/Response/EnableUserInGroupResponse.php
index ea5a9a0..4592e84 100644
--- a/src/Client/Response/EnableUserInGroupResponse.php
+++ b/src/Client/Response/EnableUserInGroupResponse.php
@@ -20,10 +20,7 @@
  */
 class EnableUserInGroupResponse extends Response
 {
-    /**
-     * @param mixed $curlResponse
-     */
-    public function __construct($curlResponse)
+    public function __construct(string $curlResponse)
     {
         $this->processCurlResponse($curlResponse);
     }
diff --git a/src/Client/Response/GlancesResponse.php b/src/Client/Response/GlancesResponse.php
index 9ad5532..8cac543 100644
--- a/src/Client/Response/GlancesResponse.php
+++ b/src/Client/Response/GlancesResponse.php
@@ -20,10 +20,7 @@
  */
 class GlancesResponse extends Response
 {
-    /**
-     * @param mixed $curlResponse
-     */
-    public function __construct($curlResponse)
+    public function __construct(string $curlResponse)
     {
         $this->processCurlResponse($curlResponse);
     }
diff --git a/src/Client/Response/LicenseResponse.php b/src/Client/Response/LicenseResponse.php
index 113672e..0e7cb1d 100644
--- a/src/Client/Response/LicenseResponse.php
+++ b/src/Client/Response/LicenseResponse.php
@@ -25,10 +25,7 @@ class LicenseResponse extends Response
      */
     private int $credits;
 
-    /**
-     * @param mixed $curlResponse
-     */
-    public function __construct($curlResponse)
+    public function __construct(string $curlResponse)
     {
         $this->processCurlResponse($curlResponse);
     }
diff --git a/src/Client/Response/ListGroupsResponse.php b/src/Client/Response/ListGroupsResponse.php
index e400c67..7aadf4d 100644
--- a/src/Client/Response/ListGroupsResponse.php
+++ b/src/Client/Response/ListGroupsResponse.php
@@ -25,10 +25,7 @@ final class ListGroupsResponse extends Response
      */
     public array $groups = [];
 
-    /**
-     * @param mixed $curlResponse
-     */
-    public function __construct($curlResponse)
+    public function __construct(string $curlResponse)
     {
         $this->processCurlResponse($curlResponse);
     }
diff --git a/src/Client/Response/MessageResponse.php b/src/Client/Response/MessageResponse.php
index 7fbdace..ad665db 100644
--- a/src/Client/Response/MessageResponse.php
+++ b/src/Client/Response/MessageResponse.php
@@ -28,10 +28,7 @@ class MessageResponse extends Response
      */
     private string $receipt;
 
-    /**
-     * @param mixed $curlResponse
-     */
-    public function __construct($curlResponse)
+    public function __construct(string $curlResponse)
     {
         $this->processCurlResponse($curlResponse);
     }
diff --git a/src/Client/Response/ReceiptResponse.php b/src/Client/Response/ReceiptResponse.php
index 82bbf85..7f2553e 100644
--- a/src/Client/Response/ReceiptResponse.php
+++ b/src/Client/Response/ReceiptResponse.php
@@ -66,10 +66,7 @@ class ReceiptResponse extends Response
      */
     private ?\DateTime $calledBackAt;
 
-    /**
-     * @param mixed $curlResponse
-     */
-    public function __construct($curlResponse)
+    public function __construct(string $curlResponse)
     {
         $this->processCurlResponse($curlResponse);
     }
diff --git a/src/Client/Response/RemoveUserFromGroupResponse.php b/src/Client/Response/RemoveUserFromGroupResponse.php
index d697b2a..9d2c668 100644
--- a/src/Client/Response/RemoveUserFromGroupResponse.php
+++ b/src/Client/Response/RemoveUserFromGroupResponse.php
@@ -20,10 +20,7 @@
  */
 class RemoveUserFromGroupResponse extends Response
 {
-    /**
-     * @param mixed $curlResponse
-     */
-    public function __construct($curlResponse)
+    public function __construct(string $curlResponse)
     {
         $this->processCurlResponse($curlResponse);
     }
diff --git a/src/Client/Response/RenameGroupResponse.php b/src/Client/Response/RenameGroupResponse.php
index 728ffbe..1245a9b 100644
--- a/src/Client/Response/RenameGroupResponse.php
+++ b/src/Client/Response/RenameGroupResponse.php
@@ -20,10 +20,7 @@
  */
 class RenameGroupResponse extends Response
 {
-    /**
-     * @param mixed $curlResponse
-     */
-    public function __construct($curlResponse)
+    public function __construct(string $curlResponse)
     {
         $this->processCurlResponse($curlResponse);
     }
diff --git a/src/Client/Response/SubscriptionResponse.php b/src/Client/Response/SubscriptionResponse.php
index e0d02fb..4614d34 100644
--- a/src/Client/Response/SubscriptionResponse.php
+++ b/src/Client/Response/SubscriptionResponse.php
@@ -25,10 +25,7 @@ class SubscriptionResponse extends Response
      */
     private string $subscribed_user_key;
 
-    /**
-     * @param mixed $curlResponse
-     */
-    public function __construct($curlResponse)
+    public function __construct(string $curlResponse)
     {
         $this->processCurlResponse($curlResponse);
     }
diff --git a/src/Client/Response/UserGroupValidationResponse.php b/src/Client/Response/UserGroupValidationResponse.php
index 2d99f87..9f2cd31 100644
--- a/src/Client/Response/UserGroupValidationResponse.php
+++ b/src/Client/Response/UserGroupValidationResponse.php
@@ -32,10 +32,7 @@ class UserGroupValidationResponse extends Response
      */
     private array $licenses;
 
-    /**
-     * @param mixed $curlResponse
-     */
-    public function __construct($curlResponse)
+    public function __construct(string $curlResponse)
     {
         $this->processCurlResponse($curlResponse);
     }