code: func (c *Users) GetSpaceUsage() (out *GetSpaceUsageOutput, err error) {
  	body, err := c.call("/users/get_space_usage", nil)
  	if err != nil {
  		return
  	}
  	defer body.Close()
  
  	err = json.NewDecoder(body).Decode(&out)
  	return
  }
docs: // GetSpaceUsage returns space usage information for the current user's account.