Does the IPN listening URL have to be setup in the Fundraiser plugin if you are not accepting recurring donations? In other words, it will be a one time donation.
As per instructions in the Fundraiser plugin setup screen: In order for Fundraising to function correctly you must setup an IPN listening URL with PayPal. Failure to do so will prevent your site from being notified when a recurring payment is cancelled.
I need the site to be able to use the same Paypal address for taking donations and subscribing to a membership level through Membership Pro 2. It is a multi-site and would be way too much trouble to ask a new site owner on the network to setup an IPN listening forwarder as suggested in: