here is a
related forum post
all you need to do is just remove the price cap, which is by default set to 0$
I think it will convert it to pay as you go automatically. You may wait for some time. Refer this similar thread:
http://social.msdn.microsoft.com/Forums/en-US/windowsazurepurchasing/thread/2c276469-00d3-4a72-8105-1ef1b20a9928/
For any other account or subscription issue, you can open a support ticket to get help from portal. You can get it by clicking the member icon at the right up corner of the portal page.
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Please mark as answered if it helped Vishal Narayan Saxena http://twitter.com/vishalishere http://www.ogleogle.com/vishal/