Hi Jonathan, You may have confused the client ID from the Developer's Console with the customer ID from AdWords. You will want to use your AdWords CID. You can use the *CustomerService.get()* without specifying the clientCustomerId <https://developers.google.com/adwords/api/docs/guides/soap#clientCustomerId> SOAP header. For other services, such as *CampaignService*, you will need to specify a clientCustomerId.
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