How to automatically retrieve current adword spend from google

Does anyone know a guide or tutorial into how to access the Google adwords reports? I'm trying to pull in to my application the advertising spend per day (current to the time of checking or last Google update). I can't quite find the API docs or methods for getting the spend. Does anyone know of any good tutorials? Or can you point me in the right direction? Idea开发者_如何学Pythonlly dev should be in php :)

UPDATE

Using the API is er....at a cost. I'm ideally looking for a way to not have to pay for it! So if there is no "backend" way of doing it for free, then scraping the front end is a possibility I guess...

UPDATE 2

Ignore the above, the cost is so minimal, an API call is enough. But I still can't find the API method to get current or previous spend....

Let us google that for you...

Have you looked at http://google-apility.sourceforge.net?

The query you want I think is this one (includes cost data).