How do I get an access token for Adwords?

Hi, 

I want to automate my keyword research, and as far as I understand, I have to get an access token for my PHP code.  (adding it to the auth.ini file) 

I am trying to follow this guide: https://developers.google.com/adwords/api/docs/guides/start 

I just cant find the right place to get my access token. 

I already have an account (by clicking 'sign in' in the top right just gets me signed in..) 

Can you please help me find the right way to get the access token?  

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