Old Authentication in API v2
We’re going to be removing the old Flickr-style authentication mechanism from version 2 of the Advanced API —at the end of this month, on August 31—. You will need to use OAuth to authenticate with version 2 from then on.
We’ve made it really simple to switch over: you can easily convert your auth tokens into OAuth tokens through the API without having to re-authenticate your users. (More information in this post)
Our latest PHP library is compatible with OAuth, so just drop it in and you should be good to go. There are plenty of other OAuth libraries out there for other languages too. There’s a great list on the official OAuth code page.
Updated: We’ve pushed back the date to September 15 to give everyone a little more time.
