diff --git a/lib/Gr4vyConfig.php b/lib/Gr4vyConfig.php
index 2c8eb7f..e8d6b5a 100644
--- a/lib/Gr4vyConfig.php
+++ b/lib/Gr4vyConfig.php
@@ -119,7 +119,7 @@ public static function getToken($private_key, $scopes = array(), $embed = array(
         $now   = new DateTimeImmutable();
         $tokenBuilder = $config->builder()
                 // Configures the issuer (iss claim)
-                ->issuedBy('Gr4vy SDK 0.20.0')
+                ->issuedBy('Gr4vy SDK 0.21.0')
                 // Configures the id (jti claim)
                 ->identifiedBy(self::gen_uuid())
                 // Configures the time that the token was issue (iat claim)
@@ -415,6 +415,10 @@ public function refundTransaction($transaction_id, $refund_request) {
         $response = $this->post("/transactions/" . $transaction_id . "/refunds", $refund_request);
         return $response;
     }
+    public function voidTransaction($transaction_id, $request = array()) {
+        $response = $this->post("/transactions/" . $transaction_id . "/void", $request);
+        return $response;
+    }
     public function newCheckoutSession($request = array()) {
         $response = $this->post("/checkout/sessions", $request);
         return $response;
diff --git a/test/Api/TransactionsApiTest.php b/test/Api/TransactionsApiTest.php
index c03b8c2..18fcf12 100644
--- a/test/Api/TransactionsApiTest.php
+++ b/test/Api/TransactionsApiTest.php
@@ -201,4 +201,29 @@ public function testRefundTransaction()
             $this->fail("Exception thrown: " . $e->getMessage());
         }
     }
+
+    /**
+     * Test case for voidTransaction
+     *
+     * Void transaction.
+     *
+     */
+    public function testVoidTransaction()
+    {
+
+        try {
+            $config = new Gr4vyConfig(self::$gr4vyId, self::$privateKeyLocation);
+            $transaction_request = array("amount"=>100,"currency"=>"USD", "intent"=>"authorize", "payment_method"=>array("method"=>"card", "number"=>"4111111111111111", "expiration_date"=> "01/28", "security_code"=>"555"));
+            $result = $config->authorizeNewTransaction($transaction_request);
+            $this->assertArrayHasKey("id", $result);
+            $this->assertEquals($result["type"], "transaction");
+
+            $result = $config->voidTransaction($result["id"]);
+            $this->assertArrayHasKey("id", $result);
+            $this->assertEquals($result["status"], "authorization_voided");
+            // print_r($result);
+        } catch (Exception $e) {
+            $this->fail("Exception thrown: " . $e->getMessage());
+        }
+    }
 }