WooCommerce Rest Api：获取特定customerId的订单

Question

I can access orders by order status but I want to access with customerId. Here's the code to access with order status. When I add parameter customerId, it returns all the records.

$params = array('status'=>'processing');
$data = $woocommerce->get('orders', $params);
    echo json_encode(
    $data
);