To integrate Nudge with DFP, you will need to:
1. Open the creative in DFP
2. In the creative's "Settings" tab, paste the Nudge code URL, which will look something like https://cdn.ndg.io/your-nudge-code.js -- you will need to paste this link into the "Third-party Impression Tracking URLs" at the bottom of the settings menu.
Please visit https://ndg.io/installation/<YOUR USERNAME> to retrieve your code URL. Paste only the URL inside the quote marks, after "src=".
3. Click Save.
Please reference here if you need any further support.