code: func (c *Client) GetAuthWithOptions(accessToken string, options GetAuthOptions) (resp GetAuthResponse, err error) {
  	if accessToken == "" {
  		return resp, errors.New("/auth/get - access token must be specified")
  	}
  
  	req := getAuthRequest{
  		ClientID:    c.clientID,
  		Secret:      c.secret,
  		AccessToken: accessToken,
  	}
  	if len(options.AccountIDs) > 0 {
  		req.Options.AccountIDs = options.AccountIDs
  	}
  
  	jsonBody, err := json.Marshal(req)
  	if err != nil {
  		return resp, err
  	}
  
  	err = c.Call("/auth/get", jsonBody, &resp)
  	return resp, err
  }
docs: // GetAuthWithOptions retrieves bank account and routing numbers associated with an Item's
  // checking and savings accounts, along with other information.
  // See https://plaid.com/docs/api/#auth.