Problem with Payment via PayPal

-- HikaShop version -- : 3.0.1
-- Joomla version -- : 3.6.5
-- PHP version -- : 7.0.14
-- Browser(s) name and version -- : Firefox 52.0.2

Hello Community

I using Hikashop 3.0.1 to sell Digital Downloads on Joomla 3.6.5. When a Customer buy a Download and Pay with PayPal than after Buy Process the Customer Status is not Automatically set to Confirmed. I have read the Documentation and I have seen that i must enable Allow payment Notification from PayPal. I have do this but it is not Automatically set to Confirmed on Google I have read that i Must Acctivat Instant Payment Notifikation in my Account when i try to do this, PayPal tell me i must enter a Notification Url but in the Documentation on Hikashop i cant find wich URL i must enter.

Have somebody the same Problem?