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Hi Lee, that is from our developer site for those that use our free APIs to integrate with GoToWebinar. Until we are confident that we have measures in place that will prevent abuse of a feature like this, we will not enable bulk uploading of registrants. Without the right checks in place, an Organizer could register anyone without their knowledge and then use our system to spam them.
There are many providers that can also assist you with importing contact lists to your webinar registration pages if needed: https://www.gotomeeting.com/integration-marketplace