Meta Business API & Messaging Permissions Explained

To build safe, scalable, and official Instagram automations, you must understand the underlying engine: the Meta Business API (specifically, the Instagram Graph API).

Rather than simulating human clicks or parsing app views, official software communicates directly with Meta's servers. This server-to-server connection makes your setup 100% compliant, but it does require setting up the correct developer permissions.

In this tutorial, we will explain how the Graph API works, what permission scopes are required, and how webhooks drive instant auto-replies.

The Graph API Architecture

The Meta Graph API is a HTTP-based API that developers use to read and write data to Facebook, Instagram, and WhatsApp. In Graph API terms, everything is represented as a node (like a User, Page, or Media object) connected by edges (relationships, like comments on a post).

When a customer comments on your Instagram Reel, here is the cycle:

1. Webhook Trigger: Meta detects the comment and posts an HTTP payload to TamilDM's endpoint.
2. Permission Check: Our application verifies it has active credentials (access tokens) for your page.
3. API Action: We send a POST request back to Meta to publish a reply comment or slide into the user's DM.

Required Permission Scopes

When connecting your Instagram Professional account to TamilDM, Meta will present an authentication dialog showing specific scopes. To automate comments and DMs, our application requests the following scopes:

• instagram_basic: Allows reading basic profile metadata and media objects.
• instagram_manage_comments: Necessary to read comments on your posts and publish auto-replies.
• instagram_manage_messages: Required to read direct messages (DMs), story mentions, and send automated text, cards, and buttons.
• pages_show_list & pages_read_engagement: Needed to list and link the Facebook page connected to your Instagram account.

Managing Access Tokens

Authentication is handled via OAuth 2.0. You never share your password. Instead, you grant a secure cryptographic credential called an Access Token.

Meta uses a hierarchy of tokens:

1. Short-Lived User Tokens: Issued during login, valid for 2 hours.
2. Long-Lived User Tokens: Swapped on the server, valid for 60 days.
3. Long-Lived Page/System Tokens: Exchanged for business integrations, these can last indefinitely until you explicitly revoke access in your Facebook settings.

If you ever change your password or disconnect your Facebook page, Meta invalidates these tokens immediately for safety. You will need to click "Reconnect" inside TamilDM to swap in a fresh token.

How Webhooks Provide Instant Replies

Webhooks are the secret to real-time response times. Instead of constant polling (which wastes battery and hits rate limits), Meta webhooks push events directly to our servers the second they happen.

Here is an example payload representing an incoming Instagram comment trigger:

{
  "object": "instagram",
  "entry": [
    {
      "id": "178414013401",
      "time": 1783746618,
      "changes": [
        {
          "field": "comments",
          "value": {
            "id": "179512345678",
            "text": "send details",
            "from": {
              "id": "178414022222",
              "username": "happy_creator"
            }
          }
        }
      ]
    }
  ]
}

TamilDM inspects the text ("send details"), checks your active rules for keywords, and issues a secure API response to reply in milliseconds.

In the next guides, we will detail how to configure these rules for keyword triggers and comment-to-DM funnels.