public function getAllAmazonPayOrders() {
        global $wpdb;

        $order_meta_table_name = $wpdb->prefix . 'usces_order_meta';
        $query = $wpdb->prepare(
            "SELECT order_id
            FROM {$order_meta_table_name}
            WHERE meta_key = %s
            ORDER BY order_id ASC",
            Models\OrderMeta::CHARGE_PERMISSION_ID
        );
        $orderIds = $wpdb->get_results($query, ARRAY_A);
        if (empty($orderIds)) {
            return [];
        }

        return $orderIds;
    }