Under the tab "Redirects" you can set up your Redirect-URL (also known as Exit URL).
This would be a global exit URL and all your traffic would be redirected here in case of errors, fraud or if your offers reach its cap or gets paused. If no Redirect URL is set then it will redirect to the google home page.
Click here to learn where traffic is forwarded in case of pausing.
Note: You can only set up one Redirect URL. To setup custom URL for every offer, you can use the Smart Link function.