code: func (c Client) CancelRequest(id string) (bool, error) {
  	holder := map[string]interface{}{}
  	if err := c.Delete("transactions/"+id+"/cancel_request", nil, &holder); err != nil {
  		return false, err
  	}
  	if holder["success"].(bool) {
  		return true, nil
  	}
  	return false, nil
  }
docs: // CancelRequest cancels a transaction request referenced by id