Ok I found out how to get a token:

Activating PDT

To use PDT, you must activate PDT and Auto Return in your PayPal account profile. You must also acquire a PDT identity token, which is used in all PDT communication you send to PayPal.

Follow these steps to configure your account for PDT:

1. Log in to your PayPal account.
2. Click the Profile subtab.
3. Click Website Payment Preferences in the Seller Preferences column.
4. Under Auto Return for Website Payments, click the On radio button.
5. For the Return URL, enter the URL on your site that will receive the transaction ID posted by PayPal after a customer payment.
6. Under Payment Data Transfer, click the On radio button.
7. Click Save.
8. Click Website Payment Preferences in the Seller Preferences column.
9. Scroll down to the Payment Data Transfer section of the page to view your PDT identity token.


Remaining Questions:
Will this token work for both sites that I use this paypal account for?
How can I recover the order that was placed and payed with paypal echeck? I see the payment in paypal but no order in Zen. Any chance of recovering the order? Don't know what to ship!

Thank you for all the help so far...