Just discovered that Paypal interface has changed since I last logged in.
If you need to locate the Paypal Auth Token, and PDT (Payment Data Transfer), login to your Paypal account and click on:
My Account (main tab) –> Profile (sub-tab).
On the left navi (box), click on “My Selling Tools”.
On the right panel –> “Website Preferences” (click on the update link)
See the screenshot below: