My stats package says there was 2 clicks and Google Adwords says there was 4 yesterday. How can I reconcile this?
They will always be different. Contact AdWords support and be prepared to provide detailed info if you think you're in line for a refund.
Just a thought in passing, but I don't know where you are. I know that Adwords defaults to US time unless I tell it the account is based in the UK. As a result, if I forget this, then my numbers don't add up the same. Not to mention the fact that my scheduled reports don't arrive until mid-morning!