try to retrieve commission meta using dokan_commission_meta key

Author: juah255

includes/Order/Hooks.php

@@ -59,6 +59,21 @@ public function __construct() {
         add_filter( 'woocommerce_can_reduce_order_stock', [ $this, 'prevent_stock_reduction_for_parent_order' ], 10, 2 );
 
         add_action( 'woocommerce_reduce_order_item_stock', [ $this, 'sync_parent_order_item_stock' ], 10, 3 );
+
+        // if _dokan_commission_meta does not exists, search for dokan_commission_meta
+        add_filter( 'woocommerce_order_item_get__dokan_commission_meta', [ $this, 'get_dokan_commission_meta' ], 10, 2 );
+    }
+
+    /**
+     * Retrieve commission meta using old dokan_commission_meta.
+     *
+     * @return mixed
+     */
+    public function get_dokan_commission_meta( $value, $item ) {
+        if( empty( $value ) ) {
+            return $item->get_meta( 'dokan_commission_meta', true );
+        }
+        return $value;
     }
 
     /**