diff --git a/src/Entities/DTO/MerchantBusinessEvent/OrderConfirmedBusinessEvent.php b/src/Entities/DTO/MerchantBusinessEvent/OrderConfirmedBusinessEvent.php
index 6c81229..9b96485 100644
--- a/src/Entities/DTO/MerchantBusinessEvent/OrderConfirmedBusinessEvent.php
+++ b/src/Entities/DTO/MerchantBusinessEvent/OrderConfirmedBusinessEvent.php
@@ -128,8 +128,8 @@ protected function validateData()
             !is_bool($this->almaP1XStatus) ||
             !is_bool($this->almaBNPLStatus) ||
             !is_bool($this->wasBNPLEligible) ||
-            !is_string($this->orderId) ||
-            !is_string($this->cartId) ||
+            (!is_string($this->orderId) || empty($this->orderId)) ||
+            (!is_string($this->cartId) || empty($this->cartId)) ||
             // Alma payment id should be absent for non Alma payments
             (!$this->isAlmaPayment() && !is_null($this->almaPaymentId))
         )
@@ -140,7 +140,7 @@ protected function validateData()
         //Alma payment id for Alma payment, Must be a string
         if(
             $this->isAlmaPayment() &&
-            !is_string($this->almaPaymentId)
+            (!is_string($this->almaPaymentId) || empty($this->almaPaymentId))
         )
         {
             throw new ParametersException('Alma payment id is mandatory for Alma payment');
diff --git a/tests/Unit/Entities/DTO/MerchantBusinessEvent/OrderConfirmedBusinessEventTest.php b/tests/Unit/Entities/DTO/MerchantBusinessEvent/OrderConfirmedBusinessEventTest.php
index 935b34d..2728d2e 100644
--- a/tests/Unit/Entities/DTO/MerchantBusinessEvent/OrderConfirmedBusinessEventTest.php
+++ b/tests/Unit/Entities/DTO/MerchantBusinessEvent/OrderConfirmedBusinessEventTest.php
@@ -52,6 +52,11 @@ public function testAlmaPaymentIdIsMandatoryForBnplAlmaPayment()
         $this->expectException(ParametersException::class);
         new OrderConfirmedBusinessEvent(false, true, true, "42", "54");
     }
+    public function testAlmaPaymentIdCanNotBeAnEmptyStringForAnAlmaPayment()
+    {
+        $this->expectException(ParametersException::class);
+        new OrderConfirmedBusinessEvent(false, true, true, "42", "54", "");
+    }
 
     public function testAlmaPaymentIdShouldBeAbsentForNonAlmaPayments()
     {
@@ -201,6 +206,13 @@ public static function invalidDataForBusinessEventDataProvider()
                 'orderId' => "1",
                 'cartId' => "1"
             ],
+            "Order id is empty string" => [
+                'isP1X' => false,
+                'isBNPL' => false,
+                'wasEligible' => true,
+                'orderId' => "",
+                'cartId' => "14"
+            ],
             "Order id is an int" => [
                 'isP1X' => false,
                 'isBNPL' => false,
@@ -271,6 +283,13 @@ public static function invalidDataForBusinessEventDataProvider()
                 'orderId' => '1',
                 'cartId' => new \stdClass()
             ],
+            "Cart id is empty string" => [
+                'isP1X' => false,
+                'isBNPL' => false,
+                'wasEligible' => true,
+                'orderId' => "1",
+                'cartId' => ""
+            ],
         ];
     }
 }