Enumeration Events

If the job includes a callback URL, a comma-separated list of notification events to which to subscribe. Valid events are * recognitions.started generates a callback notification when the service begins to process the job. * recognitions.completed generates a callback notification when the job is complete. You must use the Check a job method to retrieve the results before they time out or are deleted. * recognitions.completed_with_results generates a callback notification when the job is complete. The notification includes the results of the request. * recognitions.failed generates a callback notification if the service experiences an error while processing the job. The recognitions.completed and recognitions.completed_with_results events are incompatible. You can specify only of the two events. If the job includes a callback URL, omit the parameter to subscribe to the default events: recognitions.started, recognitions.completed, and recognitions.failed. If the job does not include a callback URL, omit the parameter.