code: func (c *Client) ListCheckoutKeys(account, repo string) ([]*CheckoutKey, error) {
  	checkoutKeys := []*CheckoutKey{}
  
  	err := c.request("GET", fmt.Sprintf("project/%s/%s/checkout-key", account, repo), &checkoutKeys, nil, nil)
  	if err != nil {
  		return nil, err
  	}
  
  	return checkoutKeys, nil
  }
docs: // ListCheckoutKeys fetches the checkout keys associated with the given project