Hello,
Thank you for posting to the PayPal Merchant Technical Support Community.
Usually you get a NOT_AUTHORIZED for the following reasons:
You processed the authorization in a different PayPal Account than you processed the void call
You are using a 3rd Party API call and you have not granted permissions to your App to perform a void call
You are pointed to Sandbox for the authorization and live for the void request
Thank you,
Jennifer
PayPal
... View more