Agencies or advertisers that have invoice billing enabled and use Bing Ads Insertion Orders can now create and approve IOs online rather than having to rely on email or fax.
This has been a top request among agencies, in particular. Insertion orders can be created either by the customer or a Bing Ads account manager. Once an IO is approved via the API or the web interface, campaigns will begin to run. It’s possible to create overlapping IOs so that there is never an advertising lapse between orders.
More details are available on the Bing Ads site.