Paypal IPN notification url showing as plugin setup not as defined in profile.

I am testing Fundraising Plugin and Membership plugin on the same multisite network.

When I look at the transaction in the paypal sandbox it is showing that each transaction has a notification URL that is as listed in the setup of each wpmudev plugin and NOT the IPN url set in the selling tools section. The setup instructs us to set the IPN notification url in the profile in paypal accounts.

The handshake between Membership2 and Paypal, Fundraising and Paypal looks to be exchanging the notification URL.

Are these two plugins dynamically setting the notification url?

Do all the the wpmudev plugins with paypal payments doing dynamic setting of notification URL ?

Can you confirm this action for sandbox and live or is this some sandbox quirk?

thank you