code: func (r Dns_Domain_Registration) SetAuthenticationCode(authenticationCode *string) (resp bool, err error) {
  	params := []interface{}{
  		authenticationCode,
  	}
  	err = r.Session.DoRequest("SoftLayer_Dns_Domain_Registration", "setAuthenticationCode", params, &r.Options, &resp)
  	return
  }
docs: // The setAuthenticationCode method sets the authentication code for the domain. The authentication code is a transfer key and provides an extra level of security, safeguarding domain names from unauthorized transfers.