---
title: "Message type constants"
url: "https://help.internetx.com/en/api/core-message-type-constants/"
lang: "en"
section: "API reference — API reference (XML/JSON)"
breadcrumb: "API documentation (JSON/XML) > Enums and constants"
updated: "2023-09-26"
---

# Message type constants

## Description

Describes which of the possible notifications in the course of the preregistration process it is.

## Possible values

-   INITIAL = First notification. Sent if the preregistration phase was active within the last week.
-   FIRST\_REMINDER = First reminder. Sent when the possibility of preregistration confirmation ends in the next 5 days.