I have successfully hooked Drupal Commerce, Commerce Product Key, and Commerce PayPal in my dev site and test purchases show that keys are being assigned to completed purchases.

The issue: I'm trying to create a workflow rule (Send mail) that will automatically email the product key to the purchaser, but, I can't find any tokens to use (none are listed in REPLACEMENT PATTERNS). I've tried looking through the huge list in the Pathauto module, but did not find one either. So how do I call on it so that a product key can be sent through email after completing the purchase?

Thanks,
Mike