> ## Documentation Index
> Fetch the complete documentation index at: https://developer.hubmessage.io/llms.txt
> Use this file to discover all available pages before exploring further.

# Introduction

> Key Meta concepts for understanding and using the WhatsApp Official API

export const frontendUrl = 'https://app.hubmessage.io';

export const projectName = 'Hub Message';

## Overview

In this documentation, you'll find the key Meta concepts for understanding how the **WhatsApp Official API** works, connecting your numbers, and making the most of {projectName}'s features.

Here you'll learn how to:

* Create and manage your **Business Portfolio** in Meta Business Manager
* Connect numbers via **Cloud API** or **Coexistence** mode
* Migrate an existing number to the Official API
* Understand how **payment**, the **24-hour window**, and **billing** work
* Create and manage **message templates**

<CardGroup cols={2}>
  <Card title="Business Portfolio" icon="building" href="/en/whatsapp-official/portfolio/introduction">
    How to create and verify your portfolio in Meta Business Manager
  </Card>

  <Card title="Connection" icon="link" href="/en/whatsapp-official/connection/cloud-api">
    Connect your number via Cloud API or Coexistence
  </Card>

  <Card title="Number migration" icon="arrow-right-arrow-left" href="/en/whatsapp-official/migrate-number">
    Migrate an existing number to the Official API
  </Card>

  <Card title="Payment and Billing" icon="credit-card" href="/en/whatsapp-official/payment">
    Understand how Meta's billing model works
  </Card>
</CardGroup>

<Note>
  If you don't have a channel created yet, first see how to [create a channel](/en/channels/create-channel) before moving on to connecting the Official API.
</Note>