diff --git a/src/Nuvei/Api/Service/BaseService.php b/src/Nuvei/Api/Service/BaseService.php
index d0aaf51..c115f9a 100644
--- a/src/Nuvei/Api/Service/BaseService.php
+++ b/src/Nuvei/Api/Service/BaseService.php
@@ -103,7 +103,7 @@ public function appendMerchantIdMerchantSiteIdTimeStamp($params = [])
             $params = ['merchantId' => $this->client->getConfig()->getMerchantId()] + $params;
         }
         if (empty($params['timeStamp'])) {
-            $params['timeStamp'] = date('YmdHms');
+            $params['timeStamp'] = date('YmdHis');
         }
 
         return $params;