You can configure the default fallback behaviour in every offer. This will allow you to have all the control of the traffic that don't match with your offer.
First, please consider that the offer fallback configuration is not mandatory. Also, in case you have configured a specific fallback for an offer, this will only apply if the Affiliate configured the Fallback URL as Fallback Policy.
How to configure the offer fallback in Aftrad
In every offer, you can configure the fallback.
You have three different options:
Offer: this is a combo where you have all available offers for the platform.
Smartlink: this is a combo where you have all available Smartlinks for the platform.
URL: this is a free URL text box where you can configure whatever URL you want.
Important: if you choose the URL option, the platform will considerer that the traffic is sent out of Aftrad.