Hi Pratik, Thank you for reaching out. The error USER_PERMISSION_DENIED usually occurs when there is no link between the manager account authenticated in the request and the client account specified in the headers. This type of issue is not due to the authentication itself. Rather, it is because the account you are authenticated with does not have the management rights to the client customer account as they are not linked. You would need to make sure they are linked in order to successfully make the API call.
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