I had the same doubt, but I found out that there is no longer any need to configure it for another application. The explanation was right in front of me (us), on the iTunes Connect homepage:
Updating the configuration of the iAd application network After you sign the contract for the supply of iAd applications and integrate the iAd Framework into the application, all approved and ready-to-use applications will be eligible to receive iAd ads. You no longer need to include each iAd application in the Manage Your Applications module.
Vic ht
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