code: func (o *OrderService) Get(orderURL string) (acme.Order, error) {
  	if len(orderURL) == 0 {
  		return acme.Order{}, errors.New("order[get]: empty URL")
  	}
  
  	var order acme.Order
  	_, err := o.core.postAsGet(orderURL, &order)
  	if err != nil {
  		return acme.Order{}, err
  	}
  
  	return order, nil
  }
docs: // Get Gets an order.