In pro sites it is written the following:
To use PayPal Express Checkout or Pro you must manually turn on IPN notifications and enter your IPN url (https://my.domain/wp-admin/admin-ajax.php?action=psts_pypl_ipn) in your PayPal profile (you must also do this in your sandbox account when testing).
Where does this URL need to be entered exactly?
At PM-Memebership Pro Plugin it is written just the opposite:
This URL is passed to PayPal for all new charges and subscriptions. You SHOULD NOT set this in your PayPal account settings.
So if you are using in your multisite both plugins they would conflict with each other. Right?