In your PayPal Account go to Profile under the Selling Preferences / Instant Payment Notification Preferences and Enable it and then enter your Notification URL: and Save.
Under Profile again use Website Payment Preferences set Auto Return ON and enter your Return URL: then Payment Data Transfer: set to ON and it should generate an Identity Token which you need to copy/paste into your Payment part on your Tracker.
That should be it I think from memory?
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