diff --git a/modules/ppcp-wc-gateway/src/Gateway/PayUponInvoice/PayUponInvoice.php b/modules/ppcp-wc-gateway/src/Gateway/PayUponInvoice/PayUponInvoice.php
index 7d616a20d..7b5cd4f6b 100644
--- a/modules/ppcp-wc-gateway/src/Gateway/PayUponInvoice/PayUponInvoice.php
+++ b/modules/ppcp-wc-gateway/src/Gateway/PayUponInvoice/PayUponInvoice.php
@@ -248,7 +248,8 @@ class PayUponInvoice {
 						$wc_order->save_meta_data();
 						$paypal_fee = $breakdown->paypal_fee();
 						if ( $paypal_fee ) {
-							update_post_meta( $wc_order->get_id(), 'PayPal Transaction Key', $paypal_fee->value() );
+							$wc_order->update_meta_data( 'PayPal Transaction Key', $paypal_fee->value() );
+							$wc_order->save_meta_data();
 						}
 					}
 				} catch ( RuntimeException $exception ) {
diff --git a/modules/ppcp-wc-gateway/src/WCGatewayModule.php b/modules/ppcp-wc-gateway/src/WCGatewayModule.php
index cc3b89202..09c233dba 100644
--- a/modules/ppcp-wc-gateway/src/WCGatewayModule.php
+++ b/modules/ppcp-wc-gateway/src/WCGatewayModule.php
@@ -90,7 +90,8 @@ class WCGatewayModule implements ModuleInterface {
 					$wc_order->save_meta_data();
 					$paypal_fee = $breakdown->paypal_fee();
 					if ( $paypal_fee ) {
-						update_post_meta( $wc_order->get_id(), 'PayPal Transaction Key', $paypal_fee->value() );
+						$wc_order->update_meta_data( 'PayPal Transaction Key', $paypal_fee->value() );
+						$wc_order->save_meta_data();
 					}
 				}