Those of you who are patiently waiting for Google to fix the verification tag in the Webmaster Tools API for the past two months just has to wait a bit longer.
In short, those who are tying to use the Webmaster Tools API to verify their sites with Google Webmaster Tools are running into issues. The reason is, the meta tag being generated via the API is wrong and needs to be updated by Google. This has been going on since October 2009.
Dennis G. from Google promised he will finally update it to work in January, sometime. He said:
We've partly updated the API already. The rest will be fixed in January. Sorry for the delay.
Forum discussion at Google Webmaster Help.