diff --git a/includes/integration.php b/includes/integration.php
index c7b7517..3ab471e 100644
--- a/includes/integration.php
+++ b/includes/integration.php
@@ -304,7 +304,13 @@ function process_order_markdown( $code ) {
         }
 
         $customer       = $order->get_user();
-        $used_coupons   = $order->get_used_coupons() ? implode( ',', $order->get_used_coupons() ) : '';
+
+        if ( version_compare( WC()->version, '3.7', '<=' ) ) {
+            $used_coupons   = $order->get_coupon_codes() ? implode( ',', $order->get_coupon_codes() ) : '';
+        } else {
+            $used_coupons   = $order->get_used_coupons() ? implode( ',', $order->get_used_coupons() ) : '';
+        }
+
         $order_currency = $order_currency;
         $order_total    = $order->get_total();
         $order_number   = $order->get_order_number();
diff --git a/includes/integrations/class-integration-custom.php b/includes/integrations/class-integration-custom.php
index a63cfb9..d1dd14c 100644
--- a/includes/integrations/class-integration-custom.php
+++ b/includes/integrations/class-integration-custom.php
@@ -118,7 +118,13 @@ function process_order_markdown( $code, $order_id ) {
         }
 
         $customer       = $order->get_user();
-        $used_coupons   = $order->get_used_coupons() ? implode( ',', $order->get_used_coupons() ) : '';
+
+        if ( version_compare( WC()->version, '3.7', '<=' ) ) {
+            $used_coupons   = $order->get_coupon_codes() ? implode( ',', $order->get_coupon_codes() ) : '';
+        } else {
+            $used_coupons   = $order->get_used_coupons() ? implode( ',', $order->get_used_coupons() ) : '';
+        }
+
         $order_currency = $order_currency;
         $order_total    = $order->get_total() ? $order->get_total() : 0;
         $order_number   = $order->get_order_number();