diff --git a/src/Model/Suppression/BaseResponse.php b/src/Model/Suppression/BaseResponse.php
index bc5516a..e97d2fb 100644
--- a/src/Model/Suppression/BaseResponse.php
+++ b/src/Model/Suppression/BaseResponse.php
@@ -20,49 +20,28 @@ use Mailgun\Model\ApiResponse;
  */
 abstract class BaseResponse implements ApiResponse
 {
-    /**
-     * @var string
-     */
     private $address;
-
-    /**
-     * @var string
-     */
     private $message;
 
-    /**
-     * @param string $address
-     * @param string $message
-     */
-    private function __construct($address, $message)
+    private function __construct()
     {
-        $this->address = $address;
-        $this->message = $message;
     }
 
-    /**
-     * @return BaseResponse
-     */
-    public static function create(array $data)
+    public static function create(array $data): self
     {
-        $address = isset($data['address']) ? $data['address'] : '';
-        $message = isset($data['message']) ? $data['message'] : '';
+        $model = new static();
+        $model->address = $data['address'] ?? '';
+        $model->message = $data['message'] ?? '';
 
-        return new static($address, $message);
+        return $model;
     }
 
-    /**
-     * @return string
-     */
-    public function getAddress()
+    public function getAddress(): string
     {
         return $this->address;
     }
 
-    /**
-     * @return string
-     */
-    public function getMessage()
+    public function getMessage(): string
     {
         return $this->message;
     }
diff --git a/src/Model/Suppression/Bounce/Bounce.php b/src/Model/Suppression/Bounce/Bounce.php
index 77a8a4d..35f4107 100644
--- a/src/Model/Suppression/Bounce/Bounce.php
+++ b/src/Model/Suppression/Bounce/Bounce.php
@@ -16,105 +16,44 @@ namespace Mailgun\Model\Suppression\Bounce;
  */
 class Bounce
 {
-    /**
-     * @var string
-     */
     private $address;
-
-    /**
-     * @var string
-     */
     private $code;
-
-    /**
-     * @var string
-     */
     private $error;
-
-    /**
-     * @var \DateTime
-     */
     private $createdAt;
 
-    /**
-     * @param string $address
-     */
-    private function __construct($address)
+    private function __construct()
     {
-        $this->address = $address;
-        $this->createdAt = new \DateTime();
     }
 
-    /**
-     * @return Bounce
-     */
-    public static function create(array $data)
+    public static function create(array $data): self
     {
-        $bounce = new self($data['address']);
+        $model = new self();
 
-        if (isset($data['code'])) {
-            $bounce->setCode($data['code']);
-        }
-        if (isset($data['error'])) {
-            $bounce->setError($data['error']);
-        }
-        if (isset($data['created_at'])) {
-            $bounce->setCreatedAt(new \DateTime($data['created_at']));
-        }
+        $model->address = $data['address'] ?? null;
+        $model->code = $data['code'] ?? null;
+        $model->error = $data['error'] ?? null;
+        $model->createdAt = isset($data['created_at']) ? new \DateTimeImmutable($data['created_at']) : null;
 
-        return $bounce;
+        return $model;
     }
 
-    /**
-     * @return string
-     */
-    public function getAddress()
+    public function getAddress(): ?string
     {
         return $this->address;
     }
 
-    /**
-     * @return string
-     */
-    public function getCode()
+    public function getCode(): ?string
     {
         return $this->code;
     }
 
-    /**
-     * @param string $code
-     */
-    private function setCode($code)
-    {
-        $this->code = $code;
-    }
-
-    /**
-     * @return string
-     */
-    public function getError()
+    public function getError(): ?string
     {
         return $this->error;
     }
 
-    /**
-     * @param string $error
-     */
-    private function setError($error)
-    {
-        $this->error = $error;
-    }
-
-    /**
-     * @return \DateTime
-     */
-    public function getCreatedAt()
+    public function getCreatedAt(): ?\DateTimeImmutable
     {
         return $this->createdAt;
     }
-
-    private function setCreatedAt(\DateTime $createdAt)
-    {
-        $this->createdAt = $createdAt;
-    }
 }
diff --git a/src/Model/Suppression/Bounce/IndexResponse.php b/src/Model/Suppression/Bounce/IndexResponse.php
index 8ea1cf3..5eb1db5 100644
--- a/src/Model/Suppression/Bounce/IndexResponse.php
+++ b/src/Model/Suppression/Bounce/IndexResponse.php
@@ -22,24 +22,13 @@ final class IndexResponse implements ApiResponse, PagingProvider
 {
     use PaginationResponse;
 
-    /**
-     * @var Bounce[]
-     */
     private $items;
 
-    /**
-     * @param Bounce[] $items
-     */
-    private function __construct(array $items, array $paging)
+    private function __construct()
     {
-        $this->items = $items;
-        $this->paging = $paging;
     }
 
-    /**
-     * @return IndexResponse
-     */
-    public static function create(array $data)
+    public static function create(array $data): self
     {
         $bounces = [];
         if (isset($data['items'])) {
@@ -48,13 +37,18 @@ final class IndexResponse implements ApiResponse, PagingProvider
             }
         }
 
-        return new self($bounces, $data['paging']);
+        $model = new self();
+
+        $model->items = $bounces;
+        $model->paging = $data['paging'];
+
+        return $model;
     }
 
     /**
      * @return Bounce[]
      */
-    public function getItems()
+    public function getItems(): array
     {
         return $this->items;
     }
diff --git a/src/Model/Suppression/Complaint/Complaint.php b/src/Model/Suppression/Complaint/Complaint.php
index e3ca6d6..5e5d4f1 100644
--- a/src/Model/Suppression/Complaint/Complaint.php
+++ b/src/Model/Suppression/Complaint/Complaint.php
@@ -16,57 +16,30 @@ namespace Mailgun\Model\Suppression\Complaint;
  */
 class Complaint
 {
-    /**
-     * @var string
-     */
     private $address;
-
-    /**
-     * @var \DateTime
-     */
     private $createdAt;
 
-    /**
-     * @param string $address
-     */
-    private function __construct($address)
+    private function __construct()
     {
-        $this->address = $address;
-        $this->createdAt = new \DateTime();
     }
 
-    /**
-     * @return Complaint
-     */
-    public static function create(array $data)
+    public static function create(array $data): self
     {
-        $complaint = new self($data['address']);
+        $model = new self();
 
-        if (isset($data['created_at'])) {
-            $complaint->setCreatedAt(new \DateTime($data['created_at']));
-        }
+        $model->address = $data['address'] ?? null;
+        $model->createdAt = isset($data['created_at']) ? new \DateTimeImmutable($data['created_at']) : null;
 
-        return $complaint;
+        return $model;
     }
 
-    /**
-     * @return string
-     */
-    public function getAddress()
+    public function getAddress(): ?string
     {
         return $this->address;
     }
 
-    /**
-     * @return \DateTime
-     */
-    public function getCreatedAt()
+    public function getCreatedAt(): ?\DateTimeImmutable
     {
         return $this->createdAt;
     }
-
-    private function setCreatedAt(\DateTime $createdAt)
-    {
-        $this->createdAt = $createdAt;
-    }
 }
diff --git a/src/Model/Suppression/Complaint/IndexResponse.php b/src/Model/Suppression/Complaint/IndexResponse.php
index 973e39b..9320b14 100644
--- a/src/Model/Suppression/Complaint/IndexResponse.php
+++ b/src/Model/Suppression/Complaint/IndexResponse.php
@@ -22,24 +22,13 @@ final class IndexResponse implements ApiResponse, PagingProvider
 {
     use PaginationResponse;
 
-    /**
-     * @var Complaint[]
-     */
     private $items;
 
-    /**
-     * @param Complaint[] $items
-     */
-    private function __construct(array $items, array $paging)
+    private function __construct()
     {
-        $this->items = $items;
-        $this->paging = $paging;
     }
 
-    /**
-     * @return IndexResponse
-     */
-    public static function create(array $data)
+    public static function create(array $data): self
     {
         $complaints = [];
         if (isset($data['items'])) {
@@ -48,13 +37,18 @@ final class IndexResponse implements ApiResponse, PagingProvider
             }
         }
 
-        return new self($complaints, $data['paging']);
+        $model = new self();
+
+        $model->items = $complaints;
+        $model->paging = $data['paging'];
+
+        return $model;
     }
 
     /**
      * @return Complaint[]
      */
-    public function getItems()
+    public function getItems(): array
     {
         return $this->items;
     }
diff --git a/src/Model/Suppression/Unsubscribe/IndexResponse.php b/src/Model/Suppression/Unsubscribe/IndexResponse.php
index e257b2f..683bd5d 100644
--- a/src/Model/Suppression/Unsubscribe/IndexResponse.php
+++ b/src/Model/Suppression/Unsubscribe/IndexResponse.php
@@ -41,24 +41,11 @@ final class IndexResponse implements ApiResponse, PagingProvider
      */
     private $totalCount;
 
-    /**
-     * @see Mailgun/Model/Suppression/Unsubscribe/Unsubscribe
-     *
-     * @param Unsubscribe[] $items
-     */
-    private function __construct(array $items, array $paging)
+    private function __construct()
     {
-        $this->items = $items;
-        $this->paging = $paging;
     }
 
-    /**
-     * Allow create the unsubscribe items with paging.
-     *
-     *
-     * @return IndexResponse
-     */
-    public static function create(array $data)
+    public static function create(array $data): self
     {
         $unsubscribes = [];
         if (isset($data['items'])) {
@@ -67,29 +54,23 @@ final class IndexResponse implements ApiResponse, PagingProvider
             }
         }
 
-        return new self($unsubscribes, $data['paging']);
+        $model = new self();
+
+        $model->items = $unsubscribes;
+        $model->paging = $data['paging'];
+
+        return $model;
     }
 
     /**
-     * Get the Unsusbscribe item models from the response.
-     *
-     * @see Mailgun/Model/Suppression/Unsubscribe/Unsubscribe
-     *
      * @return Unsubscribe[]
      */
-    public function getItems()
+    public function getItems(): array
     {
         return $this->items;
     }
 
-    /**
-     * Get the total count of Unsusbscribe in index response.
-     *
-     * @see Mailgun/Model/Suppression/Unsubscribe/Unsubscribe
-     *
-     * @return int
-     */
-    public function getTotalCount()
+    public function getTotalCount(): int
     {
         if (null === $this->totalCount) {
             $this->totalCount = count($this->items);
diff --git a/src/Model/Suppression/Unsubscribe/Unsubscribe.php b/src/Model/Suppression/Unsubscribe/Unsubscribe.php
index 44195fe..0cbc4e7 100644
--- a/src/Model/Suppression/Unsubscribe/Unsubscribe.php
+++ b/src/Model/Suppression/Unsubscribe/Unsubscribe.php
@@ -16,80 +16,39 @@ namespace Mailgun\Model\Suppression\Unsubscribe;
  */
 class Unsubscribe
 {
-    /**
-     * @var string
-     */
     private $address;
-
-    /**
-     * @var \DateTime
-     */
     private $createdAt;
-
-    /**
-     * @var array
-     */
     private $tags = [];
 
-    /**
-     * @param string $address
-     */
-    private function __construct($address)
+    private function __construct()
     {
-        $this->address = $address;
-        $this->createdAt = new \DateTime();
     }
 
-    /**
-     * @return Unsubscribe
-     */
-    public static function create(array $data)
+    public static function create(array $data): self
     {
-        $unsubscribe = new self($data['address']);
+        $model = new self();
+
+        $model->address = $data['address'] ?? null;
+        $model->createdAt = isset($data['created_at']) ? new \DateTimeImmutable($data['created_at']) : null;
 
         if (isset($data['tags'])) {
-            $unsubscribe->setTags($data['tags']);
-        }
-        if (isset($data['created_at'])) {
-            $unsubscribe->setCreatedAt(new \DateTime($data['created_at']));
+            $model->tags = $data['tags'];
         }
 
-        return $unsubscribe;
+        return $model;
     }
 
-    /**
-     * @return string
-     */
-    public function getAddress()
+    public function getAddress(): ?string
     {
         return $this->address;
     }
 
-    /**
-     * @return \DateTime
-     */
-    public function getCreatedAt()
+    public function getCreatedAt(): ?\DateTimeImmutable
     {
         return $this->createdAt;
     }
 
-    private function setCreatedAt(\DateTime $createdAt)
-    {
-        $this->createdAt = $createdAt;
-    }
-
-    /**
-     * @param array $tags
-     */
-    private function setTags($tags)
-    {
-        $this->tags = $tags;
-    }
-
-    /**
-     * @return array
-     */
-    public function getTags()
+    public function getTags(): array
     {
         return $this->tags;
     }