diff --git a/config/toss-payments.php b/config/toss-payments.php
index 72cd81a..c0f6e1c 100644
--- a/config/toss-payments.php
+++ b/config/toss-payments.php
@@ -7,4 +7,4 @@
     'secret_key' => env('TOSS_PAYMENTS_SECRET_KEY'),
     'content_type' => 'application/json',
     'accept' => 'application/json',
-];
\ No newline at end of file
+];
diff --git a/src/Attributes/Payment.php b/src/Attributes/Payment.php
index ad0583f..f859884 100644
--- a/src/Attributes/Payment.php
+++ b/src/Attributes/Payment.php
@@ -10,22 +10,22 @@
 class Payment extends TossPayments implements AttributeInterface
 {
     /**
-     * @var string $uri
+     * @var string
      */
     protected string $uri;
 
     /**
-     * @var string $paymentKey
+     * @var string
      */
     protected string $paymentKey;
 
     /**
-     * @var string $orderId
+     * @var string
      */
     protected string $orderId;
 
     /**
-     * @var int $amount
+     * @var int
      */
     protected int $amount;
 
@@ -51,7 +51,7 @@ public function initializeUri(): static
      */
     public function createEndpoint(?string $endpoint): string
     {
-        return $this->url . $this->uri . $this->start($endpoint);
+        return $this->url.$this->uri.$this->start($endpoint);
     }
 
     /**
@@ -104,7 +104,7 @@ public function confirm(): PromiseInterface|Response
      */
     public function get(): PromiseInterface|Response
     {
-        return $this->client->get($this->createEndpoint('/' . $this->paymentKey));
+        return $this->client->get($this->createEndpoint('/'.$this->paymentKey));
     }
 
     /**
@@ -112,6 +112,6 @@ public function get(): PromiseInterface|Response
      */
     public function order(): PromiseInterface|Response
     {
-        return $this->client->get($this->createEndpoint('/orders/' . $this->orderId));
+        return $this->client->get($this->createEndpoint('/orders/'.$this->orderId));
     }
-}
\ No newline at end of file
+}
diff --git a/src/Attributes/Transaction.php b/src/Attributes/Transaction.php
index 9b5736c..08972cf 100644
--- a/src/Attributes/Transaction.php
+++ b/src/Attributes/Transaction.php
@@ -9,22 +9,22 @@
 class Transaction extends TossPayments implements AttributeInterface
 {
     /**
-     * @var string $uri
+     * @var string
      */
     protected string $uri;
 
     /**
-     * @var string $startDate
+     * @var string
      */
     protected string $startDate;
 
     /**
-     * @var string $endDate
+     * @var string
      */
     protected string $endDate;
 
     /**
-     * @var string $startingAfter
+     * @var string
      */
     protected string $startingAfter;
 
@@ -55,7 +55,7 @@ public function initializeUri(): static
      */
     public function createEndpoint(?string $endpoint): string
     {
-        return $this->url . $this->uri . $this->start($endpoint);
+        return $this->url.$this->uri.$this->start($endpoint);
     }
 
     /**
@@ -93,6 +93,7 @@ public function startingAfter(string $startingAfter): static
 
     /**
      * @return $this
+     *
      * @throws LargeLimitException
      */
     public function limit(int $limit): static
@@ -115,4 +116,4 @@ public function get()
             'limit' => $this->limit,
         ]);
     }
-}
\ No newline at end of file
+}
diff --git a/src/Contracts/AttributeInterface.php b/src/Contracts/AttributeInterface.php
index 3eea436..8b86f3b 100644
--- a/src/Contracts/AttributeInterface.php
+++ b/src/Contracts/AttributeInterface.php
@@ -5,6 +5,8 @@
 interface AttributeInterface
 {
     public function __construct();
+
     public function initializeUri(): static;
+
     public function createEndpoint(?string $endpoint): string;
-}
\ No newline at end of file
+}
diff --git a/src/Exceptions/LargeLimitException.php b/src/Exceptions/LargeLimitException.php
index fc79dad..2a4f26f 100644
--- a/src/Exceptions/LargeLimitException.php
+++ b/src/Exceptions/LargeLimitException.php
@@ -5,4 +5,4 @@
 class LargeLimitException extends \Exception
 {
     protected $message = 'limit 가 10000을 초과하였습니다.';
-}
\ No newline at end of file
+}
diff --git a/src/TossPayments.php b/src/TossPayments.php
index 9b140ad..f63cd44 100644
--- a/src/TossPayments.php
+++ b/src/TossPayments.php
@@ -8,42 +8,42 @@
 class TossPayments
 {
     /**
-     * @var string $attribute
+     * @var string
      */
     protected $attribute;
 
     /**
-     * @var $client
+     * @var
      */
     protected $client;
 
     /**
-     * @var string $url
+     * @var string
      */
     protected string $endpoint;
 
     /**
-     * @var string $version
+     * @var string
      */
     protected string $version;
 
     /**
-     * @var string $url
+     * @var string
      */
     protected string $url;
 
     /**
-     * @var string $clientKey
+     * @var string
      */
     protected string $clientKey;
 
     /**
-     * @var string $secretKey
+     * @var string
      */
     protected string $secretKey;
 
     /**
-     * @var array $headers
+     * @var array
      */
     protected array $headers = [];
 
@@ -93,7 +93,7 @@ protected function initializeApiUrl(): static
     {
         $this->endpoint = config('toss-payments.endpoint');
         $this->version = config('toss-payments.version');
-        $this->url = $this->endpoint . '/' . $this->version;
+        $this->url = $this->endpoint.'/'.$this->version;
 
         return $this;
     }
@@ -115,7 +115,7 @@ protected function initializeKeys(): static
     protected function initializeHeaders(): static
     {
         $this->headers = [
-            'Authorization' => 'Basic ' . base64_encode($this->secretKey . ':'),
+            'Authorization' => 'Basic '.base64_encode($this->secretKey.':'),
             'Content-Type' => 'application/json',
         ];
 
diff --git a/src/TossPaymentsServiceProvider.php b/src/TossPaymentsServiceProvider.php
index 14efdf2..0b09af7 100644
--- a/src/TossPaymentsServiceProvider.php
+++ b/src/TossPaymentsServiceProvider.php
@@ -32,4 +32,4 @@ public function boot(): void
             __DIR__."/../config/{$this->name}.php" => config_path($this->name.'.php'),
         ], 'config');
     }
-}
\ No newline at end of file
+}