code: func NewClient(apiUrl string, accountId string, httpClient *http.Client) (*Client, error) {
  	if httpClient == nil {
  		httpClient = http.DefaultClient
  	}
  	au, err := url.Parse(apiUrl)
  	if err != nil {
  		return nil, err
  	}
  
  	c := &Client{
  		client:    httpClient,
  		BaseURL:   au,
  		AccountId: accountId,
  	}
  	return c, nil
  }
docs: // NewClient allocates and configures a Client for interacting with the API.
  //
  // apiUrl should be an url of the form https://api.region.brightbox.com,
  // e.g: https://api.gb1.brightbox.com. You can use the default defined in
  // this package instead, i.e. brightbox.DefaultRegionApiURL
  //
  // accountId should be the identifier of the default account to be used with
  // this Client. Clients authenticated with Brightbox ApiClient credentials are
  // only ever associated with one single Account, so you can leave this empty for
  // those. Client's authenticated with Brightbox User credentials can have access
  // to multiple accounts, so this parameter should be provided.
  //
  // httpClient should be a http.Client with a transport that will handle the
  // OAuth token authentication, such as those provided by
  // https://github.com/golang/oauth2/