I am trying to call API /restapi/v1.0/account/accountId/extension/extensionId/fax for send fax.
But I am getting exception:
"errorCode": "InsufficientPermissions", "message": "In order to call this API endpoint, application needs to have [Faxes] permission"
This is a permission issue happens when you call an API of an application that doesn't have that specific permission.
Check the following:
This literally just happened to me with another application leveraging the [RingOut] permission. I'd mistakenly used an existing app in the sandbox that lacked that permission and saw the same error.
The fix is to:
This worked to solve my immediate problem and might also help with yours.
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