This video shows you how to push payments from Paypal to Tend as events.
Once you set this up, you'll be able to:
If you already have an IPN URL in PayPal, there is a workaround using Zapier. This workaround lets you forward IPNs so that you can use several IPN URLs.
Here's how to do it: https://zapier.com/help/how-use-multiple-ipns-paypal/