docs(whatsapp): ✨ Update WhatsApp Business API setup guide

* Add registration process for new phone numbers
* Clarify importance of registration for sending messages and 2FA
* Improve formatting and clarity throughout the document

WHATSAPP_BUSINESS.md

@@ -5,6 +5,7 @@ This guide will help you set up WhatsApp Business API credentials for use with W
 ## Common Error: "Object does not exist or missing permissions"
 
 If you see this error:
+
 ```
 Failed to connect client account_id=test error="API returned status 400:
 {\"error\":{\"message\":\"Unsupported get request. Object with ID 'XXXXXXXXX' does not exist,
@@ -74,6 +75,7 @@ curl -X GET 'https://graph.facebook.com/v21.0/debug_token?input_token=YOUR_TOKEN
 ```
 
 Look for `"scopes"` in the response - it should include:
+
 ```json
 {
   "data": {
@@ -106,6 +108,7 @@ curl -X GET 'https://graph.facebook.com/v21.0/YOUR_BUSINESS_ACCOUNT_ID/phone_num
 ```
 
 Response:
+
 ```json
 {
   "data": [
@@ -128,13 +131,85 @@ curl -X GET 'https://graph.facebook.com/v21.0/me/businesses' \
 ```
 
 Or find it in WhatsApp Manager:
+
 1. Go to WhatsApp Manager
 2. Click on **Settings** (gear icon)
 3. The Business Account ID is shown in the URL: `https://business.facebook.com/wa/manage/home/?waba_id=XXXXXXXXX`
 
-## Step 7: Test Your Credentials
+## Step 7: Register Your Phone Number (Required for New Numbers)
 
-Before configuring WhatsHooked, test your credentials:
+If this is a new phone number that hasn't been used for WhatsApp Business API before, you need to register it first.
+
+### Why Registration is Needed
+
+Phone numbers must be registered with WhatsApp to:
+
+- Activate the number for sending messages
+- Set up two-factor authentication (2FA)
+- Verify ownership of the phone number
+
+### Registration Process
+
+**1. Get your 2FA PIN:**
+
+You should have received a 6-digit PIN when you set up your WhatsApp Business phone number. If you don't have it:
+
+- Go to [WhatsApp Manager](https://business.facebook.com/wa/manage/home/)
+- Select your phone number
+- Go to **Settings** → **Two-step verification**
+- Note or reset your PIN
+
+**2. Register the phone number:**
+
+```bash
+# Replace PHONE_NUMBER_ID with your Phone Number ID
+# Replace YOUR_TOKEN with your access token
+# Replace 890523 with your actual 2FA PIN
+curl -X POST 'https://graph.facebook.com/v21.0/PHONE_NUMBER_ID/register' \
+  -H 'Authorization: Bearer YOUR_TOKEN' \
+  -H 'Content-Type: application/json' \
+  -d '{
+    "messaging_product": "whatsapp",
+    "pin": "123123"
+  }'
+```
+
+**Successful Response:**
+
+```json
+{
+  "success": true
+}
+```
+
+**Error Response (if already registered):**
+
+```json
+{
+  "error": {
+    "message": "(#131030) Phone number has already been registered",
+    "type": "OAuthException",
+    "code": 131030,
+    "fbtrace_id": "..."
+  }
+}
+```
+
+**Note:** If you get error code 131030, it means your number is already registered and you can skip this step.
+
+### Important Notes
+
+- ⚠️ **You only need to register once** - don't repeat this step unless you're setting up a new number
+- ⚠️ **Keep your PIN secure** - it's used for two-factor authentication
+- ⚠️ **Registration can take a few minutes** - wait before sending messages
+- ⚠️ **If registration fails**, verify:
+  - Your PIN is correct (6 digits)
+  - Your access token has `whatsapp_business_management` permission
+  - The phone number is verified in Meta Business Manager
+
+## Step 8: Test Your Credentials
+
+After registration, test your credentials to confirm everything is working:
 
 ```bash
 # Replace PHONE_NUMBER_ID and YOUR_TOKEN
@@ -143,6 +218,7 @@ curl -X GET 'https://graph.facebook.com/v21.0/PHONE_NUMBER_ID' \
 ```
 
 If successful, you'll get a response like:
+
 ```json
 {
   "verified_name": "Your Business Name",
@@ -154,7 +230,7 @@ If successful, you'll get a response like:
 
 If you get an error like `"error_subcode":33`, your token lacks permissions - go back to Step 4.
 
-## Step 8: Configure WhatsHooked
+## Step 9: Configure WhatsHooked
 
 Update your `config.json` with the Business API configuration:
 
@@ -180,7 +256,7 @@ Update your `config.json` with the Business API configuration:
 ### Configuration Fields
 
 | Field                 | Required | Description                                            |
-|-------|----------|-------------|
+| --------------------- | -------- | ------------------------------------------------------ |
 | `id`                  | Yes      | Unique identifier for this account in WhatsHooked      |
 | `type`                | Yes      | Must be `"business-api"`                               |
 | `phone_number`        | Yes      | Your WhatsApp Business phone number (E.164 format)     |
@@ -188,9 +264,9 @@ Update your `config.json` with the Business API configuration:
 | `access_token`        | Yes      | Permanent access token (from Step 4)                   |
 | `business_account_id` | No       | WhatsApp Business Account ID (optional, for reference) |
 | `api_version`         | No       | Graph API version (defaults to `"v21.0"`)              |
-| `verify_token` | Yes | Random string for webhook verification (see Step 8a) |
+| `verify_token`        | Yes      | Random string for webhook verification (see Step 9a)   |
 
-### Step 8a: Generate Verify Token
+### Step 9a: Generate Verify Token
 
 The verify token is used by Meta to verify your webhook endpoint. Generate a secure random string:
 
@@ -202,33 +278,36 @@ openssl rand -hex 32
 # "my_secure_verify_token_abc123xyz789"
 ```
 
-Add this token to your `config.json` (see above) and save it - you'll need it for webhook configuration in Step 10.
+Add this token to your `config.json` (see above) and save it - you'll need it for webhook configuration in Step 11.
 
-## Step 9: Start WhatsHooked
+## Step 10: Start WhatsHooked
 
 ```bash
 ./bin/whatshook-server -config config.json
 ```
 
 You should see:
+
 ```
 INFO Business API client connected account_id=business phone=+1234567890
 INFO Hook manager started and subscribed to events event_types=13
 ```
 
 If you see `Failed to connect client`, check the error message and verify:
+
 1. Phone Number ID is correct
 2. Access token has required permissions
 3. Access token hasn't expired
 4. Business Account has WhatsApp API access enabled
 
-## Step 10: Configure Webhook in Meta Developer Console
+## Step 11: Configure Webhook in Meta Developer Console
 
 WhatsHooked provides a webhook endpoint to receive incoming messages and status updates from WhatsApp.
 
-### 10.1: Webhook URL Format
+### 11.1: Webhook URL Format
 
 Your webhook URL should be:
+
 ```
 https://your-domain.com/webhooks/whatsapp/{account_id}
 ```
@@ -236,11 +315,12 @@ https://your-domain.com/webhooks/whatsapp/{account_id}
 Where `{account_id}` matches the `id` field in your config (e.g., "business").
 
 **Example**: If your domain is `api.example.com` and account ID is `business`:
+
 ```
 https://api.example.com/webhooks/whatsapp/business
 ```
 
-### 10.2: Configure in Meta Developer Console
+### 11.2: Configure in Meta Developer Console
 
 1. Go to [Meta Developers](https://developers.facebook.com/)
 2. Select your app
@@ -253,9 +333,10 @@ https://api.example.com/webhooks/whatsapp/business
 
 Meta will send a GET request to verify your endpoint. If verification succeeds, you'll see a green checkmark.
 
-### 10.3: Subscribe to Webhook Events
+### 11.3: Subscribe to Webhook Events
 
 After verification, subscribe to these webhook fields:
+
 - ✅ **messages** - Incoming messages and message status updates
 - ✅ **message_template_status_update** - Template approval/rejection (optional)
 - ✅ **account_update** - Account changes (optional)
@@ -270,7 +351,7 @@ WhatsHooked supports all WhatsApp Business API webhook events and message types:
 ### Message Types
 
 | Type          | Supported | Downloads Media | Description                       |
-|------|-----------|-----------------|-------------|
+| ------------- | --------- | --------------- | --------------------------------- |
 | `text`        | ✅        | N/A             | Text messages                     |
 | `image`       | ✅        | ✅              | Images with optional caption      |
 | `video`       | ✅        | ✅              | Videos with optional caption      |
@@ -288,7 +369,7 @@ WhatsHooked supports all WhatsApp Business API webhook events and message types:
 ### Status Updates
 
 | Status      | Event               | Description                    |
-|--------|-------|-------------|
+| ----------- | ------------------- | ------------------------------ |
 | `sent`      | `message.sent`      | Message sent from your number  |
 | `delivered` | `message.delivered` | Message delivered to recipient |
 | `read`      | `message.read`      | Message read by recipient      |
@@ -297,7 +378,7 @@ WhatsHooked supports all WhatsApp Business API webhook events and message types:
 ### Webhook Notification Types
 
 | Field                            | Description            | Events Published                           |
-|-------|-------------|------------------|
+| -------------------------------- | ---------------------- | ------------------------------------------ |
 | `messages`                       | Message events         | `message.received`, message status updates |
 | `message_template_status_update` | Template changes       | Logged to console                          |
 | `account_update`                 | Account config changes | Logged to console                          |
@@ -382,9 +463,7 @@ DEBUG Sending to hook hook_id=message_hook url=https://your-webhook.com/messages
 }
 ```
 
-## Step 11: Configure Your Webhooks
+## Step 12: Configure Your Webhooks
-
-## Step 11: Configure Your Webhooks
 
 WhatsHooked forwards events to your own webhook URLs. Configure them in `config.json`:
 
@@ -415,7 +494,7 @@ WhatsHooked forwards events to your own webhook URLs. Configure them in `config.
 ### Hook Configuration Fields
 
 | Field         | Required | Description                                 |
-|-------|----------|-------------|
+| ------------- | -------- | ------------------------------------------- |
 | `id`          | Yes      | Unique identifier for this hook             |
 | `name`        | Yes      | Human-readable name                         |
 | `url`         | Yes      | Your webhook URL to receive events          |
@@ -428,6 +507,7 @@ WhatsHooked forwards events to your own webhook URLs. Configure them in `config.
 ### Available Event Types
 
 **Message Events:**
+
 - `message.received` - Incoming messages
 - `message.sent` - Outgoing messages
 - `message.delivered` - Delivery confirmations
@@ -435,15 +515,18 @@ WhatsHooked forwards events to your own webhook URLs. Configure them in `config.
 - `message.failed` - Delivery failures
 
 **Connection Events:**
+
 - `whatsapp.connected` - Account connected
 - `whatsapp.disconnected` - Account disconnected
 
 **QR Code Events** (whatsmeow only):
+
 - `whatsapp.qr.code` - QR code for pairing
 - `whatsapp.qr.timeout` - QR code expired
 - `whatsapp.qr.error` - QR code error
 
 **Hook Events:**
+
 - `hook.triggered` - Hook was called
 - `hook.success` - Hook responded successfully
 - `hook.failed` - Hook call failed
@@ -481,6 +564,7 @@ Add to your `config.json`:
 ### When Events Are Cached
 
 Events are automatically cached when:
+
 - No webhooks are configured for the event type
 - All webhooks are inactive (`"active": false`)
 - No webhooks match the event in their `events` array
@@ -488,33 +572,39 @@ Events are automatically cached when:
 ### Cache Management API
 
 **List cached events:**
+
 ```bash
 curl -u username:password http://localhost:8080/api/cache
 ```
 
 **Get cache statistics:**
+
 ```bash
 curl -u username:password http://localhost:8080/api/cache/stats
 ```
 
 **Replay all cached events:**
+
 ```bash
 curl -X POST -u username:password http://localhost:8080/api/cache/replay
 ```
 
 **Replay specific event:**
+
 ```bash
 curl -X POST -u username:password \
   "http://localhost:8080/api/cache/event/replay?id=EVENT_ID"
 ```
 
 **Delete cached event:**
+
 ```bash
 curl -X DELETE -u username:password \
   "http://localhost:8080/api/cache/event/delete?id=EVENT_ID"
 ```
 
 **Clear all cache:**
+
 ```bash
 curl -X DELETE -u username:password \
   "http://localhost:8080/api/cache/clear?confirm=true"
@@ -553,12 +643,14 @@ curl -X DELETE -u username:password \
 **Error**: "The callback URL or verify token couldn't be validated"
 
 **Causes**:
+
 - `verify_token` mismatch between config.json and Meta console
 - WhatsHooked server not running
 - Firewall blocking Meta's IP ranges
 - Wrong webhook URL format
 
 **Fix**:
+
 1. Ensure server is running: `./bin/whatshook-server -config config.json`
 2. Check logs for verification attempt
 3. Verify token matches exactly (case-sensitive)
@@ -567,6 +659,7 @@ curl -X DELETE -u username:password \
 ### Messages Not Cached
 
 **Check**:
+
 1. `message_cache.enabled` is `true` in config
 2. Hooks are actually inactive or not matching events
 3. Check cache stats: `curl -u user:pass http://localhost:8080/api/cache/stats`
@@ -574,11 +667,13 @@ curl -X DELETE -u username:password \
 ### No Hooks Configured Error
 
 If events are being cached but you have hooks configured, check:
+
 - Hook `"active"` is `true`
 - Hook `"events"` array includes the event type (or is empty for all events)
 - Hook URL is reachable and responding with 2xx status
 
 Enable debug logging to trace the issue:
+
 ```json
 {
   "log_level": "debug"
@@ -726,10 +821,7 @@ Here's a complete `config.json` with all Business API features:
       "url": "https://your-app.com/api/whatsapp/status",
       "method": "POST",
       "active": true,
-      "events": [
+      "events": ["whatsapp.connected", "whatsapp.disconnected"],
-        "whatsapp.connected",
-        "whatsapp.disconnected"
-      ],
       "description": "Monitors connection status"
     }
   ],
@@ -761,6 +853,7 @@ Here's a complete `config.json` with all Business API features:
 WhatsHooked supports three media delivery modes:
 
 **1. Link Mode** (default, recommended)
+
 ```json
 {
   "media": {
@@ -769,11 +862,13 @@ WhatsHooked supports three media delivery modes:
   }
 }
 ```
+
 - Downloads media and stores locally
 - Webhooks receive URL: `https://your-domain.com/api/media/business/filename.jpg`
 - Efficient for large media files
 
 **2. Base64 Mode**
+
 ```json
 {
   "media": {
@@ -781,11 +876,13 @@ WhatsHooked supports three media delivery modes:
   }
 }
 ```
+
 - Encodes media as base64 in webhook payload
 - No separate download needed
 - Good for small files, increases payload size
 
 **3. Both Mode**
+
 ```json
 {
   "media": {
@@ -793,6 +890,7 @@ WhatsHooked supports three media delivery modes:
   }
 }
 ```
+
 - Provides both URL and base64
 - Maximum flexibility, largest payloads
 
@@ -820,6 +918,7 @@ Track all events to file and/or database:
 ```
 
 Logged events include:
+
 - All message events
 - Connection status changes
 - Hook success/failure
@@ -830,6 +929,7 @@ Logged events include:
 Your webhooks can respond to trigger outgoing messages:
 
 **Webhook Response Format:**
+
 ```json
 {
   "send_message": true,
@@ -866,11 +966,13 @@ Before going live:
 ### Error: "Object with ID does not exist" (error_subcode: 33)
 
 **Cause**: One of the following:
+
 - Incorrect Phone Number ID
 - Access token lacks permissions
 - Access token expired
 
 **Fix**:
+
 1. Verify token permissions (see Step 4)
 2. Double-check Phone Number ID (see Step 5)
 3. Generate a new token if needed
@@ -892,6 +994,7 @@ Before going live:
 **Issue**: Using a User Access Token instead of System User token
 
 **Fix**:
+
 - Use a System User (Step 2) for permanent tokens
 - User Access Tokens expire in 60 days
 - System User tokens can be set to "Never expire"