Hi

The company id is the  public key. This key is 5-6 characters in length. You cannot use your private key. I think you are using your private key here and hence you are getting an error message.

Thanks.

Adrian.

​@bryony,

Can you confirm that you’re attempting to use the Create or Update Client Profile endpoint to send information to Klaviyo? If so, are you getting a specific error response (like a 401/404 error)? Also, would you mind telling us more about your goal? If I know what you’re looking to achieve, I may be able to point you in the right direction!

-Byrne