diff --git a/woo-business-central/includes/class-wbc-batch-sync.php b/woo-business-central/includes/class-wbc-batch-sync.php
index ad75db7..f3d77d6 100644
--- a/woo-business-central/includes/class-wbc-batch-sync.php
+++ b/woo-business-central/includes/class-wbc-batch-sync.php
@@ -51,7 +51,7 @@ class WBC_Batch_Sync {
      * Register the Action Scheduler batch handler
      */
     public function register_hooks() {
-        add_action( self::ACTION_HOOK, array( $this, 'process_batch' ), 10, 1 );
+        add_action( self::ACTION_HOOK, array( $this, 'process_batch' ), 10, 2 );
     }
 
     /**
@@ -169,12 +169,15 @@ class WBC_Batch_Sync {
     /**
      * Process a single batch (called by Action Scheduler)
      *
-     * @param array $args Action args: run_id, product_ids.
+     * Action Scheduler spreads the associative args array passed to
+     * as_enqueue_async_action() into separate positional parameters here
+     * (it does not pass a single combined array) - the parameter order
+     * must match the key order used when the action was enqueued.
+     *
+     * @param string $run_id      Run ID this batch belongs to.
+     * @param array  $product_ids WooCommerce product IDs in this batch.
      */
-    public function process_batch( $args ) {
-        $run_id = $args['run_id'] ?? '';
-        $product_ids = $args['product_ids'] ?? array();
-
+    public function process_batch( $run_id, $product_ids = array() ) {
         $run = get_option( self::RUN_OPTION, array() );
 
         // A newer sync superseded this run (e.g. re-triggered manually) - drop it.