First of all: install the viruemart tracking extension. Go to the extension manager, select the file, and install. Then go to the plugin manager, and publish it.
Note: the extension (obviously) needs the "allow_url_fopen=1" (or allow_url_fopen="On") in your server/hosting php.ini. Check it on your system (by the php
You can setup up to 5 event goals, tracked when customers press "confirm order" (before customers pay, when the order is created in the Virtuemart db - this because the next action is to confirm order (customers pay) and it's tracked as e.commerce conversion!).The very first thing to do is setup the plugin
The IPN is the Instant Paying Notification that Paypal sends to your server when a customer pays. The "Thank You" page is where the customer returns after a payment, with the payment details for the customer.
You should setup them both on your account on Paypal, in the "profile"
It tracks also the Joomla "standart" web traffic, so you need anything else to link your e.commerce to