Paypal IPN question

Hello Guys,

Pro sites instructions:

To use PayPal Express Checkout or Pro you must manually turn on IPN notifications and enter your IPN url (http://mysite.com/wp-admin/admin-ajax.php?action=psts_pypl_ipn) in your PayPal profile (you must also do this in your sandbox account when testing).

I checked it out and it seems I would have to create a new paypal account for every IPN i set up. Does I really have to use this to work?