code: func (p *Pushover) CancelEmergencyNotification(receipt string) (*Response, error) {
  	endpoint := fmt.Sprintf("%s/receipts/%s/cancel.json", APIEndpoint, receipt)
  
  	req, err := newURLEncodedRequest("GET", endpoint, map[string]string{"token": p.token})
  	if err != nil {
  		return nil, err
  	}
  
  	response := &Response{}
  	if err := do(req, response, false); err != nil {
  		return nil, err
  	}
  
  	return response, nil
  }
docs: // CancelEmergencyNotification helps stop a notification retry in case of a
  // notification with an Emergency priority before reaching the expiration time.
  // It requires the response receipt in order to stop the right notification.