diff --git a/app/Ninja/PaymentDrivers/PaymentExpressPxPayPaymentDriver.php b/app/Ninja/PaymentDrivers/PaymentExpressPxPayPaymentDriver.php
new file mode 100644
index 000000000000..f7abef587a53
--- /dev/null
+++ b/app/Ninja/PaymentDrivers/PaymentExpressPxPayPaymentDriver.php
@@ -0,0 +1,17 @@
+<?php
+
+namespace App\Ninja\PaymentDrivers;
+
+use Request;
+
+class PaymentExpressPxPayPaymentDriver extends BasePaymentDriver
+{
+    protected function paymentDetails($paymentMethod = false)
+    {
+        $data = parent::paymentDetails();
+
+        $data['transactionId'] = $data['transactionId'] . '-' . $this->invoice()->updated_at->timestamp;
+
+        return $data;
+    }
+}
diff --git a/app/Ninja/PaymentDrivers/PaymentExpressPxPostPaymentDriver.php b/app/Ninja/PaymentDrivers/PaymentExpressPxPostPaymentDriver.php
new file mode 100644
index 000000000000..2feecc8d5d3c
--- /dev/null
+++ b/app/Ninja/PaymentDrivers/PaymentExpressPxPostPaymentDriver.php
@@ -0,0 +1,17 @@
+<?php
+
+namespace App\Ninja\PaymentDrivers;
+
+use Request;
+
+class PaymentExpressPxPostPaymentDriver extends BasePaymentDriver
+{
+    protected function paymentDetails($paymentMethod = false)
+    {
+        $data = parent::paymentDetails();
+
+        $data['transactionId'] = $data['transactionId'] . '-' . $this->invoice()->updated_at->timestamp;
+
+        return $data;
+    }
+}