The Trade Desk is not a self-serve connection — it needs a one-time setup with your Trade Desk representative before you can connect it in Segwise.
Request a Client Access Letter. Email your Trade Desk representative / account manager to start signing a Client Access Letter, so Segwise can get the access token to fetch your metrics and creative assets. You can use this email:
Subject: Segwise Client Access Request
Hey all, we're using a third-party analytics tool (Segwise) and we'd like to initiate the process of signing a Client Access Letter so we can get the access token needed for them to fetch metrics & creative assets. Please let us know if you need anything from our end. Thanks!
Enable Public API access. Ask your rep to enable Public API access for the granted user, with the PublicAPI_General_View scope.
Connect in Segwise. Go to Settings → Ad Networks → The Trade Desk, enter your TTD-Auth Token and Advertiser ID, then click Enable.