Fix styling

src/Data/PaymentResponse.php

@@ -6,8 +6,7 @@ class PaymentResponse
 {
     public function __construct(
         protected ?array $data = null
-    ) {
-    }
+    ) {}
 
     /**
      * Get the status of the payment response in lowercase.

src/Data/RefundResponse.php

@@ -6,8 +6,7 @@ class RefundResponse
 {
     public function __construct(
         protected ?array $data
-    ) {
-    }
+    ) {}
 
     /**
      * Get the status of the transaction.

src/Data/RefundStatus.php

@@ -6,8 +6,7 @@ class RefundStatus
 {
     public function __construct(
         protected ?array $data
-    ) {
-    }
+    ) {}
 
     /**
      * Get the status of the transaction.

src/Exceptions/SslcommerzException.php

@@ -2,6 +2,4 @@
 
 namespace Raziul\Sslcommerz\Exceptions;
 
-class SslcommerzException extends \Exception
-{
-}
+class SslcommerzException extends \Exception {}

src/SslcommerzClient.php

@@ -123,7 +123,7 @@ public function setCustomer(
         string $state = ' ',
         string $postal = ' ',
         string $country = 'Bangladesh',
-        string $fax = null
+        ?string $fax = null
     ): self {
         $this->customer = [
             'cus_name' => $name,
@@ -146,11 +146,11 @@ public function setCustomer(
     public function setShippingInfo(
         int $quantity,
         string $address,
-        string $name = null,
-        string $city = null,
-        string $state = null,
-        string $postal = null,
-        string $country = null
+        ?string $name = null,
+        ?string $city = null,
+        ?string $state = null,
+        ?string $postal = null,
+        ?string $country = null
     ): self {
         $this->shipping = [
             'shipping_method' => 'NO',