> ## Documentation Index
> Fetch the complete documentation index at: https://www.cometchat.com/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# Properties and Constraints

> Properties and Constraints for CometChat REST API.

Properties and constraints for the Management APIs (Multi-Tenancy).

## App Management

| **Property**                                    | **Constraints**                                                 |
| ----------------------------------------------- | --------------------------------------------------------------- |
| App name                                        | Max 100 characters, UTF8mb4 (supports all languages and emojis) |
| App version                                     | `v3` only                                                       |
| Maximum collaborators per app (team management) | 25                                                              |

## Webhooks

| **Property**                    | **Constraints**                                  |
| ------------------------------- | ------------------------------------------------ |
| Maximum webhooks per app        | 25                                               |
| Webhook URL                     | Valid URL, max 255 characters                    |
| Webhook ID                      | Max 50 characters, alphanumeric only, no spaces  |
| Webhook authentication username | Max 50 characters, alphanumeric only, no spaces  |
| Webhook authentication password | Max 100 characters, alphanumeric only, no spaces |