The OpenDirect API, supported by the Interactive Advertising Bureau, can be used to streamline the purchasing and selling of digital ad space. The API allows publishers to programmatically track packaging, pricing, and delivery of their reservations, and allows buyers to reserve and publish content to various web media. The API was compiled through the collaboration of tech analysts from AOL, Yahoo, Microsoft, and other companies. The API is RESTful supporting JSON requests and handles user authentication with OAuth.
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