how can I receive the paypal IPN on other website

IPN can only ping one address. If you point it away from WooCommerce, your orders will no longer be updated.

@mike Jolley, thank you for your reply. Can you tell me where should I point it away?

I mean where can I edit the notification url.

https://github.com/woothemes/woocommerce/blob/master/includes/gateways/paypal/includes/class-wc-gateway-paypal-request.php#L81

Thank you very much, Mike Jolley.
I updated the code,/includes/class-wc-gateway-paypal-request.php, line 81, I changed it to my receiver url, it works.