Hi Naomi,
Currently, the API program is by invitation only. Microsoft adCenter is committed to building an API solution that is scalable to meet the needs of advertisers of every size and type. In the future, all advertisers will be able to access the adCenter API.
Advertisers or agencies that are invited to the program are evaluated for size, for their ability to implement the API coding, for vertical fit, and for other criteria. Currently, the API interest form has been removed due to the overwhelming interest in to the pilot program. We will be directly contacting advertisers who are qualified candidates for the program or who have previously applied.
If you wish to learn more, you may visit the Microsoft adCenter Developer Community for more information. Here is a link to the adCenter MSDN Forums.
Thank you,
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