diff --git a/src/SubscribePro/Service/Transaction/Transaction.php b/src/SubscribePro/Service/Transaction/Transaction.php
index 320c5cf..062c52c 100644
--- a/src/SubscribePro/Service/Transaction/Transaction.php
+++ b/src/SubscribePro/Service/Transaction/Transaction.php
@@ -21,7 +21,8 @@ class Transaction extends DataObject implements TransactionInterface
         self::CURRENCY_CODE => true,
         self::ORDER_ID => false,
         self::IP => false,
-        self::EMAIL => false
+        self::EMAIL => false,
+        self::UNIQUE_ID => false
     ];
 
     /**
@@ -34,7 +35,8 @@ class Transaction extends DataObject implements TransactionInterface
         self::IP => false,
         self::EMAIL => false,
         self::CREDITCARD_MONTH => false,
-        self::CREDITCARD_YEAR => false
+        self::CREDITCARD_YEAR => false,
+        self::UNIQUE_ID => false
     ];
 
     /**
@@ -309,6 +311,23 @@ public function setCreditcardYear($creditcardYear)
         return $this->setData(self::CREDITCARD_YEAR, $creditcardYear);
     }
 
+    /**
+     * @return int|null
+     */
+    public function getUniqueId()
+    {
+        return $this->getData(self::UNIQUE_ID);
+    }
+
+    /**
+     * @param int $uniqueId
+     * @return $this
+     */
+    public function setUniqueId($uniqueId)
+    {
+        return $this->setData(self::UNIQUE_ID, $uniqueId);
+    }
+
     /**
      * @return int|null
      */
diff --git a/src/SubscribePro/Service/Transaction/TransactionInterface.php b/src/SubscribePro/Service/Transaction/TransactionInterface.php
index 4805735..b6cccb7 100644
--- a/src/SubscribePro/Service/Transaction/TransactionInterface.php
+++ b/src/SubscribePro/Service/Transaction/TransactionInterface.php
@@ -21,6 +21,7 @@ interface TransactionInterface extends DataInterface
     const CREDITCARD_MONTH = 'creditcard_month';
     const CREDITCARD_YEAR = 'creditcard_year';
     const BILLING_ADDRESS = 'billing_address';
+    const UNIQUE_ID = 'unique_id';
     const REF_PAYMENT_PROFILE_ID = 'ref_payment_profile_id';
     const REF_TRANSACTION_ID = 'ref_transaction_id';
     const REF_GATEWAY_ID = 'ref_gateway_id';
@@ -219,6 +220,17 @@ public function getCreditcardYear();
      */
     public function setCreditcardYear($creditcardYear);
 
+    /**
+     * @return int|null
+     */
+    public function getUniqueId();
+
+    /**
+     * @param int $uniqueId
+     * @return $this
+     */
+    public function setUniqueId($uniqueId);
+
     /**
      * @return int|null
      */
diff --git a/tests/Service/Transaction/TransactionTest.php b/tests/Service/Transaction/TransactionTest.php
index 4de9ea9..eb1c775 100644
--- a/tests/Service/Transaction/TransactionTest.php
+++ b/tests/Service/Transaction/TransactionTest.php
@@ -149,6 +149,7 @@ public function testGetFormData()
             TransactionInterface::CREDITCARD_MONTH => '04',
             TransactionInterface::CREDITCARD_YEAR => '2019',
             TransactionInterface::BILLING_ADDRESS => '123',
+            TransactionInterface::UNIQUE_ID => '123456789',
             TransactionInterface::REF_PAYMENT_PROFILE_ID => '414',
             TransactionInterface::REF_TRANSACTION_ID => '2323',
             TransactionInterface::REF_GATEWAY_ID => '525',
@@ -178,6 +179,7 @@ public function testGetFormData()
             TransactionInterface::EMAIL => 'email@example.com',
             TransactionInterface::ORDER_ID => '123',
             TransactionInterface::IP => '0.0.0.0',
+            TransactionInterface::UNIQUE_ID => '123456789'
         ];
 
         $this->transaction->importData($data);
@@ -198,6 +200,7 @@ public function testGetVerifyFormData()
             TransactionInterface::CREDITCARD_MONTH => '04',
             TransactionInterface::CREDITCARD_YEAR => '2019',
             TransactionInterface::BILLING_ADDRESS => '123',
+            TransactionInterface::UNIQUE_ID => '987654321',
             TransactionInterface::REF_PAYMENT_PROFILE_ID => '414',
             TransactionInterface::REF_TRANSACTION_ID => '2323',
             TransactionInterface::REF_GATEWAY_ID => '525',
@@ -225,7 +228,7 @@ public function testGetVerifyFormData()
             TransactionInterface::CURRENCY_CODE => 'currency code',
             TransactionInterface::EMAIL => 'email@example.com',
             TransactionInterface::ORDER_ID => '123',
-            TransactionInterface::IP => '0.0.0.0',
+            TransactionInterface::IP => '0.0.0.0'
         ];
 
         $this->transaction->importData($data);
@@ -246,6 +249,7 @@ public function testGetServiceFormData()
             TransactionInterface::CREDITCARD_MONTH => '04',
             TransactionInterface::CREDITCARD_YEAR => '2019',
             TransactionInterface::BILLING_ADDRESS => '123',
+            TransactionInterface::UNIQUE_ID => '918273645',
             TransactionInterface::REF_PAYMENT_PROFILE_ID => '414',
             TransactionInterface::REF_TRANSACTION_ID => '2323',
             TransactionInterface::REF_GATEWAY_ID => '525',
@@ -297,6 +301,7 @@ public function testGetTokenFormData($address, $expectedData)
             TransactionInterface::CREDITCARD_MONTH => '04',
             TransactionInterface::CREDITCARD_YEAR => '2019',
             TransactionInterface::BILLING_ADDRESS => '123',
+            TransactionInterface::UNIQUE_ID => '129834765',
             TransactionInterface::REF_PAYMENT_PROFILE_ID => '414',
             TransactionInterface::REF_TRANSACTION_ID => '2323',
             TransactionInterface::REF_GATEWAY_ID => '525',
@@ -338,6 +343,7 @@ public function getTokenFormDataTest()
                     TransactionInterface::IP => '0.0.0.0',
                     TransactionInterface::CREDITCARD_MONTH => '04',
                     TransactionInterface::CREDITCARD_YEAR => '2019',
+                    TransactionInterface::UNIQUE_ID => '129834765'
                 ]
             ],
             'With address' => [
@@ -364,6 +370,7 @@ public function getTokenFormDataTest()
                     TransactionInterface::IP => '0.0.0.0',
                     TransactionInterface::CREDITCARD_MONTH => '04',
                     TransactionInterface::CREDITCARD_YEAR => '2019',
+                    TransactionInterface::UNIQUE_ID => '129834765',
                     TransactionInterface::BILLING_ADDRESS => [
                         AddressInterface::CITY => 'city',
                         AddressInterface::COUNTRY => 'country',