What is the purpose for “return url” or “alternative url” for popunders or mobile script?

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    What is the purpose for “return url” or “alternative url” for popunders or mobile script?

    If we cannot find any advertisers to sell your traffic to, we need a place to send the traffic. This is what the “return URL” or “alternative URL” is used for. You specify where you would like for us to send the traffic to that we cannot otherwise sell.