code: func (c *Client) GetToken(token string) (services.ProvisionToken, error) {
  	out, err := c.Get(c.Endpoint("tokens", token), url.Values{})
  	if err != nil {
  		return nil, trace.Wrap(err)
  	}
  	return services.UnmarshalProvisionToken(out.Bytes(), services.SkipValidation())
  }
docs: // GetToken returns provisioning token