diff --git a/docs/categories/03-line-api.md b/docs/categories/03-line-api.md
new file mode 100644
index 0000000..bc823f9
--- /dev/null
+++ b/docs/categories/03-line-api.md
@@ -0,0 +1,962 @@
+# Line API - Subscription Management
+
+Complete documentation for subscription line management in the XUI.ONE Admin API.
+
+## 📋 Overview
+
+The Line API provides complete control over subscription lines (M3U/Xtream Codes accounts). You can create, modify, enable, disable, and delete subscription lines programmatically.
+
+### Available Operations
+
+| Operation | Action | Method | Description |
+|-----------|--------|--------|-------------|
+| **View** | `get_line` | GET | Get specific line details |
+| **Create** | `create_line` | POST | Create new subscription |
+| **Update** | `edit_line` | POST | Modify existing line |
+| **Delete** | `delete_line` | POST | Permanently remove line |
+| **Enable** | `enable_line` | POST | Activate disabled line |
+| **Disable** | `disable_line` | POST | Temporarily suspend line |
+| **Ban** | `ban_line` | POST | Block abusive account |
+| **Unban** | `unban_line` | POST | Remove ban from line |
+
+---
+
+## 🔍 Get Specific Line
+
+### Action: `get_line`
+
+Retrieve detailed information about a specific subscription line.
+
+**Parameters:**
+- `id` (required) - Line ID
+
+**Request:**
+```bash
+curl "http://your-server.com/cSbuFLhp/?api_key=8D3135D30437F86EAE2FA4A2A8345000&action=get_line&id=123"
+```
+
+**Response:**
+```json
+{
+  "status": "STATUS_SUCCESS",
+  "data": {
+    "id": "123",
+    "username": "testuser",
+    "password": "testpass123",
+    "exp_date": "1735689600",
+    "max_connections": "1",
+    "is_trial": "0",
+    "enabled": "1",
+    "is_restreamer": "0",
+    "bouquet": "[1,2,3]",
+    "notes": "Premium customer",
+    "created_at": "1609459200"
+  }
+}
+```
+
+---
+
+## ➕ Create New Line
+
+### Action: `create_line`
+
+Create a new subscription line with specified settings.
+
+**Required Parameters:**
+- `username` - Username for the line
+- `password` - Password for the line
+
+**Optional Parameters:**
+- `max_connections` - Maximum concurrent connections (default: 1)
+- `exp_date` - Expiration date (YYYY-MM-DD, timestamp, or relative like "1month")
+- `is_trial` - Trial status (0 = No, 1 = Yes)
+- `is_restreamer` - Reseller status (0 = No, 1 = Yes)
+- `bouquets_selected[]` - Array of bouquet/package IDs
+- `notes` - Admin notes
+- `contact` - Contact information
+- `isp_lock` - Lock to specific IP address
+
+**Request:**
+```bash
+curl -X POST "http://your-server.com/cSbuFLhp/?api_key=8D3135D30437F86EAE2FA4A2A8345000&action=create_line" \
+  -d "username=newuser" \
+  -d "password=securepass123" \
+  -d "max_connections=1" \
+  -d "exp_date=2025-12-31" \
+  -d "bouquets_selected[]=1" \
+  -d "bouquets_selected[]=2" \
+  -d "notes=Premium customer"
+```
+
+**Response:**
+```json
+{
+  "status": "STATUS_SUCCESS",
+  "data": {
+    "line_id": "456",
+    "username": "newuser",
+    "password": "securepass123"
+  }
+}
+```
+
+---
+
+## ✏️ Edit Existing Line
+
+### Action: `edit_line`
+
+Modify settings of an existing subscription line.
+
+**Required Parameters:**
+- `id` - Line ID to edit
+
+**Optional Parameters:**
+- `username` - New username
+- `password` - New password
+- `max_connections` - Update connection limit
+- `exp_date` - Update expiration date
+- `is_trial` - Update trial status
+- `bouquets_selected[]` - Update assigned packages
+- `notes` - Update notes
+
+**Request:**
+```bash
+curl -X POST "http://your-server.com/cSbuFLhp/?api_key=8D3135D30437F86EAE2FA4A2A8345000&action=edit_line" \
+  -d "id=123" \
+  -d "password=newpassword456" \
+  -d "max_connections=2" \
+  -d "exp_date=2026-06-30"
+```
+
+**Response:**
+```json
+{
+  "status": "STATUS_SUCCESS",
+  "data": {
+    "message": "Line updated successfully"
+  }
+}
+```
+
+---
+
+## 🗑️ Delete Line
+
+### Action: `delete_line`
+
+Permanently remove a subscription line from the panel.
+
+⚠️ **Warning:** This action cannot be undone!
+
+**Required Parameters:**
+- `id` - Line ID to delete
+
+**Request:**
+```bash
+curl -X POST "http://your-server.com/cSbuFLhp/?api_key=8D3135D30437F86EAE2FA4A2A8345000&action=delete_line" \
+  -d "id=123"
+```
+
+**Response:**
+```json
+{
+  "status": "STATUS_SUCCESS",
+  "data": {
+    "message": "Line deleted successfully"
+  }
+}
+```
+
+---
+
+## ✅ Enable Line
+
+### Action: `enable_line`
+
+Activate a previously disabled line.
+
+**Required Parameters:**
+- `id` - Line ID to enable
+
+**Request:**
+```bash
+curl -X POST "http://your-server.com/cSbuFLhp/?api_key=8D3135D30437F86EAE2FA4A2A8345000&action=enable_line" \
+  -d "id=123"
+```
+
+---
+
+## ⛔ Disable Line
+
+### Action: `disable_line`
+
+Temporarily suspend a line without deleting it.
+
+**Required Parameters:**
+- `id` - Line ID to disable
+
+**Request:**
+```bash
+curl -X POST "http://your-server.com/cSbuFLhp/?api_key=8D3135D30437F86EAE2FA4A2A8345000&action=disable_line" \
+  -d "id=123"
+```
+
+---
+
+## 🚫 Ban Line
+
+### Action: `ban_line`
+
+Permanently block an abusive or fraudulent account.
+
+**Required Parameters:**
+- `id` - Line ID to ban
+
+**Request:**
+```bash
+curl -X POST "http://your-server.com/cSbuFLhp/?api_key=8D3135D30437F86EAE2FA4A2A8345000&action=ban_line" \
+  -d "id=123"
+```
+
+---
+
+## ✓ Unban Line
+
+### Action: `unban_line`
+
+Remove ban from a previously banned line.
+
+**Required Parameters:**
+- `id` - Line ID to unban
+
+**Request:**
+```bash
+curl -X POST "http://your-server.com/cSbuFLhp/?api_key=8D3135D30437F86EAE2FA4A2A8345000&action=unban_line" \
+  -d "id=123"
+```
+
+---
+
+## 💻 Code Examples
+
+### Python
+
+```python
+import requests
+from datetime import datetime, timedelta
+
+class XUILineManager:
+    def __init__(self, base_url, api_key):
+        self.base_url = base_url
+        self.api_key = api_key
+    
+    def _make_request(self, action, data=None):
+        """Make API request"""
+        params = {
+            "api_key": self.api_key,
+            "action": action
+        }
+        
+        if data:
+            response = requests.post(self.base_url, params=params, data=data)
+        else:
+            response = requests.get(self.base_url, params=params)
+        
+        result = response.json()
+        if result["status"] != "STATUS_SUCCESS":
+            raise Exception(f"API Error: {result.get('error', 'Unknown error')}")
+        
+        return result["data"]
+    
+    def get_line(self, line_id):
+        """Get specific line details"""
+        return self._make_request("get_line", {"id": line_id})
+    
+    def create_line(self, username, password, **kwargs):
+        """Create new subscription line"""
+        data = {
+            "username": username,
+            "password": password,
+            **kwargs
+        }
+        return self._make_request("create_line", data)
+    
+    def edit_line(self, line_id, **kwargs):
+        """Edit existing line"""
+        data = {"id": line_id, **kwargs}
+        return self._make_request("edit_line", data)
+    
+    def delete_line(self, line_id):
+        """Delete line"""
+        return self._make_request("delete_line", {"id": line_id})
+    
+    def enable_line(self, line_id):
+        """Enable line"""
+        return self._make_request("enable_line", {"id": line_id})
+    
+    def disable_line(self, line_id):
+        """Disable line"""
+        return self._make_request("disable_line", {"id": line_id})
+    
+    def ban_line(self, line_id):
+        """Ban line"""
+        return self._make_request("ban_line", {"id": line_id})
+    
+    def unban_line(self, line_id):
+        """Unban line"""
+        return self._make_request("unban_line", {"id": line_id})
+
+# Usage Example
+manager = XUILineManager(
+    base_url="http://your-server.com/cSbuFLhp/",
+    api_key="8D3135D30437F86EAE2FA4A2A8345000"
+)
+
+# Create new line
+new_line = manager.create_line(
+    username="customer001",
+    password="secure123",
+    max_connections=1,
+    exp_date="2025-12-31",
+    bouquets_selected=[1, 2, 3],
+    notes="Premium customer"
+)
+print(f"Created line ID: {new_line['line_id']}")
+
+# Get line details
+line = manager.get_line(123)
+print(f"Line: {line['username']} - Expires: {line['exp_date']}")
+
+# Edit line
+manager.edit_line(
+    line_id=123,
+    password="newpassword",
+    max_connections=2
+)
+print("Line updated successfully")
+
+# Disable line
+manager.disable_line(123)
+print("Line disabled")
+```
+
+---
+
+### PHP
+
+```php
+<?php
+class XUILineManager {
+    private $baseUrl;
+    private $apiKey;
+    
+    public function __construct($baseUrl, $apiKey) {
+        $this->baseUrl = $baseUrl;
+        $this->apiKey = $apiKey;
+    }
+    
+    private function makeRequest($action, $data = null) {
+        $url = $this->baseUrl . "?api_key=" . $this->apiKey . "&action=" . $action;
+        
+        if ($data) {
+            $options = [
+                'http' => [
+                    'method' => 'POST',
+                    'header' => 'Content-type: application/x-www-form-urlencoded',
+                    'content' => http_build_query($data)
+                ]
+            ];
+            $context = stream_context_create($options);
+            $response = file_get_contents($url, false, $context);
+        } else {
+            $response = file_get_contents($url);
+        }
+        
+        $result = json_decode($response, true);
+        
+        if ($result['status'] !== 'STATUS_SUCCESS') {
+            throw new Exception("API Error: " . ($result['error'] ?? 'Unknown error'));
+        }
+        
+        return $result['data'];
+    }
+    
+    public function getLine($lineId) {
+        return $this->makeRequest("get_line", ["id" => $lineId]);
+    }
+    
+    public function createLine($username, $password, $options = []) {
+        $data = array_merge([
+            "username" => $username,
+            "password" => $password
+        ], $options);
+        
+        return $this->makeRequest("create_line", $data);
+    }
+    
+    public function editLine($lineId, $updates) {
+        $data = array_merge(["id" => $lineId], $updates);
+        return $this->makeRequest("edit_line", $data);
+    }
+    
+    public function deleteLine($lineId) {
+        return $this->makeRequest("delete_line", ["id" => $lineId]);
+    }
+    
+    public function enableLine($lineId) {
+        return $this->makeRequest("enable_line", ["id" => $lineId]);
+    }
+    
+    public function disableLine($lineId) {
+        return $this->makeRequest("disable_line", ["id" => $lineId]);
+    }
+}
+
+// Usage Example
+$manager = new XUILineManager(
+    "http://your-server.com/cSbuFLhp/",
+    "8D3135D30437F86EAE2FA4A2A8345000"
+);
+
+// Create new line
+$newLine = $manager->createLine(
+    "customer001",
+    "secure123",
+    [
+        "max_connections" => 1,
+        "exp_date" => "2025-12-31",
+        "notes" => "Premium customer"
+    ]
+);
+echo "Created line ID: " . $newLine['line_id'] . "\n";
+
+// Edit line
+$manager->editLine(123, [
+    "password" => "newpassword",
+    "max_connections" => 2
+]);
+echo "Line updated successfully\n";
+?>
+```
+
+---
+
+### JavaScript (Node.js)
+
+```javascript
+const fetch = require('node-fetch');
+
+class XUILineManager {
+    constructor(baseUrl, apiKey) {
+        this.baseUrl = baseUrl;
+        this.apiKey = apiKey;
+    }
+    
+    async makeRequest(action, data = null) {
+        const url = `${this.baseUrl}?api_key=${this.apiKey}&action=${action}`;
+        
+        const options = {
+            method: data ? 'POST' : 'GET',
+        };
+        
+        if (data) {
+            const formData = new URLSearchParams();
+            for (const [key, value] of Object.entries(data)) {
+                if (Array.isArray(value)) {
+                    value.forEach(v => formData.append(`${key}[]`, v));
+                } else {
+                    formData.append(key, value);
+                }
+            }
+            options.body = formData;
+        }
+        
+        const response = await fetch(url, options);
+        const result = await response.json();
+        
+        if (result.status !== 'STATUS_SUCCESS') {
+            throw new Error(`API Error: ${result.error || 'Unknown error'}`);
+        }
+        
+        return result.data;
+    }
+    
+    async getLine(lineId) {
+        const url = `${this.baseUrl}?api_key=${this.apiKey}&action=get_line&id=${lineId}`;
+        const response = await fetch(url);
+        const result = await response.json();
+        
+        if (result.status !== 'STATUS_SUCCESS') {
+            throw new Error(`API Error: ${result.error || 'Unknown error'}`);
+        }
+        
+        return result.data;
+    }
+    
+    async createLine(username, password, options = {}) {
+        const data = { username, password, ...options };
+        return this.makeRequest('create_line', data);
+    }
+    
+    async editLine(lineId, updates) {
+        const data = { id: lineId, ...updates };
+        return this.makeRequest('edit_line', data);
+    }
+    
+    async deleteLine(lineId) {
+        return this.makeRequest('delete_line', { id: lineId });
+    }
+    
+    async enableLine(lineId) {
+        return this.makeRequest('enable_line', { id: lineId });
+    }
+    
+    async disableLine(lineId) {
+        return this.makeRequest('disable_line', { id: lineId });
+    }
+    
+    async banLine(lineId) {
+        return this.makeRequest('ban_line', { id: lineId });
+    }
+    
+    async unbanLine(lineId) {
+        return this.makeRequest('unban_line', { id: lineId });
+    }
+}
+
+// Usage Example
+(async () => {
+    const manager = new XUILineManager(
+        'http://your-server.com/cSbuFLhp/',
+        '8D3135D30437F86EAE2FA4A2A8345000'
+    );
+    
+    try {
+        // Create new line
+        const newLine = await manager.createLine(
+            'customer001',
+            'secure123',
+            {
+                max_connections: 1,
+                exp_date: '2025-12-31',
+                bouquets_selected: [1, 2, 3],
+                notes: 'Premium customer'
+            }
+        );
+        console.log('Created line ID:', newLine.line_id);
+        
+        // Get line details
+        const line = await manager.getLine(123);
+        console.log('Line:', line.username, '- Expires:', line.exp_date);
+        
+        // Edit line
+        await manager.editLine(123, {
+            password: 'newpassword',
+            max_connections: 2
+        });
+        console.log('Line updated successfully');
+        
+    } catch (error) {
+        console.error('Error:', error.message);
+    }
+})();
+```
+
+---
+
+## 🎯 Common Use Cases
+
+### 1. Bulk Create Lines
+
+```python
+def bulk_create_lines(manager, count=10, package_ids=[1,2,3]):
+    """Create multiple lines at once"""
+    import random
+    import string
+    
+    created_lines = []
+    
+    for i in range(count):
+        # Generate random credentials
+        username = f"user{''.join(random.choices(string.digits, k=6))}"
+        password = ''.join(random.choices(string.ascii_letters + string.digits, k=12))
+        
+        try:
+            result = manager.create_line(
+                username=username,
+                password=password,
+                max_connections=1,
+                exp_date="1month",  # 1 month from now
+                bouquets_selected=package_ids
+            )
+            
+            created_lines.append({
+                'id': result['line_id'],
+                'username': username,
+                'password': password
+            })
+            
+            print(f"✓ Created: {username}")
+            
+        except Exception as e:
+            print(f"✗ Failed to create line {i+1}: {e}")
+    
+    return created_lines
+```
+
+### 2. Auto-Disable Expired Lines
+
+```python
+from datetime import datetime
+
+def disable_expired_lines(manager):
+    """Automatically disable lines that have expired"""
+    # Get all lines
+    response = requests.get(
+        manager.base_url,
+        params={"api_key": manager.api_key, "action": "get_lines"}
+    )
+    lines = response.json()['data']
+    
+    now = datetime.now().timestamp()
+    expired_count = 0
+    
+    for line in lines:
+        exp_date = int(line['exp_date'])
+        
+        # Check if expired and still enabled
+        if exp_date < now and line['enabled'] == '1':
+            try:
+                manager.disable_line(line['id'])
+                print(f"✓ Disabled expired line: {line['username']}")
+                expired_count += 1
+            except Exception as e:
+                print(f"✗ Failed to disable {line['username']}: {e}")
+    
+    print(f"\nDisabled {expired_count} expired lines")
+```
+
+### 3. Reset Password for Line
+
+```python
+import secrets
+import string
+
+def reset_line_password(manager, line_id):
+    """Generate and set a new secure password"""
+    # Generate secure password
+    alphabet = string.ascii_letters + string.digits
+    new_password = ''.join(secrets.choice(alphabet) for i in range(16))
+    
+    # Update line
+    manager.edit_line(line_id, password=new_password)
+    
+    return new_password
+
+# Usage
+new_pass = reset_line_password(manager, 123)
+print(f"New password: {new_pass}")
+```
+
+### 4. Extend Expiration Date
+
+```python
+from datetime import datetime, timedelta
+
+def extend_subscription(manager, line_id, months=1):
+    """Extend line expiration by specified months"""
+    # Get current line
+    line = manager.get_line(line_id)
+    
+    # Calculate new expiration
+    current_exp = datetime.fromtimestamp(int(line['exp_date']))
+    new_exp = current_exp + timedelta(days=30 * months)
+    new_exp_timestamp = int(new_exp.timestamp())
+    
+    # Update line
+    manager.edit_line(line_id, exp_date=new_exp_timestamp)
+    
+    print(f"Extended to: {new_exp.strftime('%Y-%m-%d')}")
+```
+
+### 5. Upgrade Line to Different Package
+
+```python
+def upgrade_line_package(manager, line_id, new_package_ids):
+    """Change line's assigned packages"""
+    manager.edit_line(
+        line_id,
+        bouquets_selected=new_package_ids
+    )
+    
+    print(f"Upgraded line {line_id} to packages: {new_package_ids}")
+
+# Usage
+upgrade_line_package(manager, 123, [1, 2, 3, 4, 5])  # Premium package
+```
+
+### 6. Export Line Credentials
+
+```python
+import csv
+
+def export_lines_to_csv(manager, filename="lines_export.csv"):
+    """Export all lines to CSV file"""
+    # Get all lines
+    response = requests.get(
+        manager.base_url,
+        params={"api_key": manager.api_key, "action": "get_lines"}
+    )
+    lines = response.json()['data']
+    
+    # Write to CSV
+    with open(filename, 'w', newline='') as csvfile:
+        fieldnames = ['id', 'username', 'password', 'exp_date', 'max_connections', 'enabled']
+        writer = csv.DictWriter(csvfile, fieldnames=fieldnames)
+        
+        writer.writeheader()
+        for line in lines:
+            writer.writerow({
+                'id': line['id'],
+                'username': line['username'],
+                'password': line['password'],
+                'exp_date': datetime.fromtimestamp(int(line['exp_date'])).strftime('%Y-%m-%d'),
+                'max_connections': line['max_connections'],
+                'enabled': 'Yes' if line['enabled'] == '1' else 'No'
+            })
+    
+    print(f"Exported {len(lines)} lines to {filename}")
+```
+
+---
+
+## 📊 Expiration Date Formats
+
+XUI.ONE accepts multiple formats for expiration dates:
+
+### 1. Specific Date (YYYY-MM-DD)
+```bash
+-d "exp_date=2025-12-31"
+```
+
+### 2. Unix Timestamp
+```bash
+-d "exp_date=1735689600"
+```
+
+### 3. Relative Time
+```bash
+# Hours
+-d "exp_date=24hours"
+
+# Days
+-d "exp_date=7days"
+
+# Months
+-d "exp_date=1month"
+-d "exp_date=3months"
+
+# Years
+-d "exp_date=1year"
+```
+
+### Python Helper Function
+
+```python
+from datetime import datetime, timedelta
+
+def format_exp_date(days=None, months=None, years=None, date=None):
+    """Convert various formats to Unix timestamp"""
+    if date:
+        # Specific date
+        dt = datetime.strptime(date, '%Y-%m-%d')
+    else:
+        # Relative date
+        dt = datetime.now()
+        if days:
+            dt += timedelta(days=days)
+        if months:
+            dt += timedelta(days=30 * months)
+        if years:
+            dt += timedelta(days=365 * years)
+    
+    return int(dt.timestamp())
+
+# Usage
+exp_date = format_exp_date(months=3)  # 3 months from now
+```
+
+---
+
+## ⚠️ Important Notes
+
+### Username/Password Requirements
+
+- **Username:** 3-50 characters, alphanumeric
+- **Password:** Minimum 6 characters recommended
+- **No special characters** in username (use only letters, numbers, underscore)
+
+### Bouquet Selection
+
+When assigning bouquets, use array notation:
+```bash
+# cURL
+-d "bouquets_selected[]=1" \
+-d "bouquets_selected[]=2"
+
+# Python
+bouquets_selected=[1, 2, 3]
+
+# PHP
+["bouquets_selected" => [1, 2, 3]]
+```
+
+### Max Connections
+
+- **Minimum:** 1
+- **Maximum:** Unlimited (but reasonable limits recommended)
+- **Common values:** 1-5 for home users, 10-50 for resellers
+
+### Trial vs. Regular Lines
+
+Trial lines can be automatically converted to regular lines:
+```python
+# Create trial
+manager.create_line(
+    username="trial001",
+    password="temp123",
+    is_trial=1,
+    exp_date="7days"
+)
+
+# Convert to regular (when customer pays)
+manager.edit_line(
+    line_id=123,
+    is_trial=0,
+    exp_date="1year"
+)
+```
+
+---
+
+## 💡 Best Practices
+
+### 1. Always Check Before Delete
+
+```python
+def safe_delete_line(manager, line_id):
+    """Delete line with confirmation"""
+    try:
+        # Get line details first
+        line = manager.get_line(line_id)
+        
+        # Confirm it's the right line
+        print(f"About to delete: {line['username']}")
+        confirm = input("Are you sure? (yes/no): ")
+        
+        if confirm.lower() == 'yes':
+            manager.delete_line(line_id)
+            print("Line deleted successfully")
+        else:
+            print("Deletion cancelled")
+            
+    except Exception as e:
+        print(f"Error: {e}")
+```
+
+### 2. Validate Input Data
+
+```python
+def validate_line_data(username, password, max_connections):
+    """Validate line data before creation"""
+    errors = []
+    
+    if len(username) < 3 or len(username) > 50:
+        errors.append("Username must be 3-50 characters")
+    
+    if not username.replace('_', '').isalnum():
+        errors.append("Username must be alphanumeric")
+    
+    if len(password) < 6:
+        errors.append("Password must be at least 6 characters")
+    
+    if max_connections < 1:
+        errors.append("Max connections must be at least 1")
+    
+    return errors
+
+# Usage
+errors = validate_line_data("user123", "pass", 1)
+if errors:
+    print("Validation errors:")
+    for error in errors:
+        print(f"  - {error}")
+else:
+    # Create line
+    manager.create_line("user123", "secure123", max_connections=1)
+```
+
+### 3. Implement Rate Limiting
+
+```python
+import time
+from functools import wraps
+
+def rate_limit(calls_per_second=2):
+    """Limit API calls to prevent overload"""
+    min_interval = 1.0 / calls_per_second
+    last_called = [0.0]
+    
+    def decorator(func):
+        @wraps(func)
+        def wrapper(*args, **kwargs):
+            elapsed = time.time() - last_called[0]
+            left_to_wait = min_interval - elapsed
+            
+            if left_to_wait > 0:
+                time.sleep(left_to_wait)
+            
+            result = func(*args, **kwargs)
+            last_called[0] = time.time()
+            return result
+        return wrapper
+    return decorator
+
+# Apply to methods
+XUILineManager.create_line = rate_limit()(XUILineManager.create_line)
+```
+
+### 4. Error Handling
+
+```python
+def create_line_with_retry(manager, username, password, retries=3):
+    """Create line with automatic retry on failure"""
+    for attempt in range(retries):
+        try:
+            return manager.create_line(username, password)
+        except Exception as e:
+            if attempt < retries - 1:
+                print(f"Attempt {attempt + 1} failed: {e}. Retrying...")
+                time.sleep(2 ** attempt)  # Exponential backoff
+            else:
+                print(f"All {retries} attempts failed")
+                raise
+```
+
+---
+
+## 📚 Related Documentation
+
+- [GET INFO API - Query Lines](02-get-info.md#1-get-all-subscription-lines)
+- [Authentication Guide](../authentication.md)
+- [Error Handling](../error-codes.md)
+
+---
+
+## 🆘 Need Help?
+
+- **GitHub Issues:** [Report problems](https://github.com/worldofiptvcom/xui-one-api-docs/issues)
+- **Community:** [World of IPTV Forums](https://www.worldofiptv.com)
+- **Documentation:** [Getting Started Guide](../getting-started.md)
diff --git a/openapi.yaml b/openapi.yaml
index cdcc2fe..02a2bec 100644
--- a/openapi.yaml
+++ b/openapi.yaml
@@ -758,6 +758,551 @@ paths:
         '401':
           $ref: '#/components/responses/Unauthorized'
 
+  /?action=get_line:
+    get:
+      summary: Get Specific Line Details
+      description: |
+        Retrieves detailed information about a specific subscription line by ID.
+        
+        **Purpose:** View detailed information for a single line.
+        
+        ---
+        
+        **Example Request:**
+        ```bash
+        curl "http://your-server.com/cSbuFLhp/?api_key=8D3135D30437F86EAE2FA4A2A8345000&action=get_line&id=123"
+        ```
+        
+        **Use Cases:**
+        - ✅ View specific line details
+        - ✅ Check line status before editing
+        - ✅ Verify line configuration
+        - ✅ Audit line settings
+      operationId: getLine
+      tags:
+        - Line API
+      parameters:
+        - $ref: '#/components/parameters/ApiKey'
+        - name: action
+          in: query
+          required: true
+          schema:
+            type: string
+            enum: [get_line]
+        - name: id
+          in: query
+          required: true
+          description: Line ID
+          schema:
+            type: integer
+          example: 123
+      responses:
+        '200':
+          description: Line details retrieved successfully
+          content:
+            application/json:
+              schema:
+                allOf:
+                  - $ref: '#/components/schemas/SuccessResponse'
+                  - type: object
+                    properties:
+                      data:
+                        $ref: '#/components/schemas/Line'
+        '401':
+          $ref: '#/components/responses/Unauthorized'
+        '404':
+          $ref: '#/components/responses/NotFound'
+
+  /?action=create_line:
+    post:
+      summary: Create New Subscription Line
+      description: |
+        Creates a new subscription line (M3U/Xtream Codes account).
+        
+        **Purpose:** Add new subscriptions to your panel.
+        
+        ---
+        
+        **Example Request:**
+        ```bash
+        curl -X POST "http://your-server.com/cSbuFLhp/?api_key=8D3135D30437F86EAE2FA4A2A8345000&action=create_line" \
+          -d "username=newuser" \
+          -d "password=newpass123" \
+          -d "max_connections=1" \
+          -d "exp_date=2025-12-31" \
+          -d "bouquets_selected[]=1" \
+          -d "bouquets_selected[]=2"
+        ```
+        
+        **Response Example:**
+        ```json
+        {
+          "status": "STATUS_SUCCESS",
+          "data": {
+            "line_id": "456",
+            "username": "newuser",
+            "password": "newpass123"
+          }
+        }
+        ```
+        
+        **Use Cases:**
+        - ✅ Create new subscriptions
+        - ✅ Add trial accounts
+        - ✅ Set up reseller lines
+        - ✅ Bulk create accounts
+      operationId: createLine
+      tags:
+        - Line API
+      parameters:
+        - $ref: '#/components/parameters/ApiKey'
+        - name: action
+          in: query
+          required: true
+          schema:
+            type: string
+            enum: [create_line]
+      requestBody:
+        required: true
+        content:
+          application/x-www-form-urlencoded:
+            schema:
+              type: object
+              required:
+                - username
+                - password
+              properties:
+                username:
+                  type: string
+                  description: Username for the line
+                  example: "newuser"
+                password:
+                  type: string
+                  description: Password for the line
+                  example: "newpass123"
+                max_connections:
+                  type: integer
+                  description: Maximum concurrent connections
+                  default: 1
+                  example: 1
+                exp_date:
+                  type: string
+                  description: Expiration date (YYYY-MM-DD, Unix timestamp, or relative like "1month", "1year")
+                  example: "2025-12-31"
+                is_trial:
+                  type: integer
+                  description: Trial account (0 = No, 1 = Yes)
+                  enum: [0, 1]
+                  default: 0
+                  example: 0
+                is_restreamer:
+                  type: integer
+                  description: Reseller status (0 = No, 1 = Yes)
+                  enum: [0, 1]
+                  default: 0
+                  example: 0
+                bouquets_selected:
+                  type: array
+                  description: Array of bouquet/package IDs to assign
+                  items:
+                    type: integer
+                  example: [1, 2, 3]
+                notes:
+                  type: string
+                  description: Admin notes
+                  example: "Premium customer"
+                contact:
+                  type: string
+                  description: Contact information
+                  example: "customer@example.com"
+                isp_lock:
+                  type: string
+                  description: Lock to specific IP address
+                  example: "192.168.1.100"
+      responses:
+        '200':
+          description: Line created successfully
+          content:
+            application/json:
+              schema:
+                allOf:
+                  - $ref: '#/components/schemas/SuccessResponse'
+        '401':
+          $ref: '#/components/responses/Unauthorized'
+
+  /?action=edit_line:
+    post:
+      summary: Edit Existing Line
+      description: |
+        Modifies an existing subscription line.
+        
+        **Purpose:** Update line settings and configuration.
+        
+        ---
+        
+        **Example Request:**
+        ```bash
+        curl -X POST "http://your-server.com/cSbuFLhp/?api_key=8D3135D30437F86EAE2FA4A2A8345000&action=edit_line" \
+          -d "id=123" \
+          -d "password=newpassword" \
+          -d "max_connections=2"
+        ```
+        
+        **Use Cases:**
+        - ✅ Change passwords
+        - ✅ Update connection limits
+        - ✅ Modify expiration dates
+        - ✅ Change assigned packages
+        - ✅ Update notes
+      operationId: editLine
+      tags:
+        - Line API
+      parameters:
+        - $ref: '#/components/parameters/ApiKey'
+        - name: action
+          in: query
+          required: true
+          schema:
+            type: string
+            enum: [edit_line]
+      requestBody:
+        required: true
+        content:
+          application/x-www-form-urlencoded:
+            schema:
+              type: object
+              required:
+                - id
+              properties:
+                id:
+                  type: integer
+                  description: Line ID to edit
+                  example: 123
+                username:
+                  type: string
+                  description: New username
+                  example: "updateduser"
+                password:
+                  type: string
+                  description: New password
+                  example: "newpass456"
+                max_connections:
+                  type: integer
+                  description: Maximum concurrent connections
+                  example: 2
+                exp_date:
+                  type: string
+                  description: New expiration date
+                  example: "2026-12-31"
+                is_trial:
+                  type: integer
+                  description: Trial status
+                  enum: [0, 1]
+                  example: 0
+                bouquets_selected:
+                  type: array
+                  description: Updated bouquet IDs
+                  items:
+                    type: integer
+                  example: [1, 2, 3, 4]
+                notes:
+                  type: string
+                  description: Updated notes
+                  example: "Extended subscription"
+      responses:
+        '200':
+          description: Line updated successfully
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/SuccessResponse'
+        '401':
+          $ref: '#/components/responses/Unauthorized'
+        '404':
+          $ref: '#/components/responses/NotFound'
+
+  /?action=delete_line:
+    post:
+      summary: Delete Line
+      description: |
+        Permanently deletes a subscription line.
+        
+        **Purpose:** Remove lines from the panel.
+        
+        ⚠️ **Warning:** This action cannot be undone!
+        
+        ---
+        
+        **Example Request:**
+        ```bash
+        curl -X POST "http://your-server.com/cSbuFLhp/?api_key=8D3135D30437F86EAE2FA4A2A8345000&action=delete_line" \
+          -d "id=123"
+        ```
+        
+        **Use Cases:**
+        - ✅ Remove expired subscriptions
+        - ✅ Delete test accounts
+        - ✅ Clean up old lines
+      operationId: deleteLine
+      tags:
+        - Line API
+      parameters:
+        - $ref: '#/components/parameters/ApiKey'
+        - name: action
+          in: query
+          required: true
+          schema:
+            type: string
+            enum: [delete_line]
+      requestBody:
+        required: true
+        content:
+          application/x-www-form-urlencoded:
+            schema:
+              type: object
+              required:
+                - id
+              properties:
+                id:
+                  type: integer
+                  description: Line ID to delete
+                  example: 123
+      responses:
+        '200':
+          description: Line deleted successfully
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/SuccessResponse'
+        '401':
+          $ref: '#/components/responses/Unauthorized'
+        '404':
+          $ref: '#/components/responses/NotFound'
+
+  /?action=enable_line:
+    post:
+      summary: Enable Line
+      description: |
+        Enables a disabled subscription line.
+        
+        **Purpose:** Reactivate suspended lines.
+        
+        ---
+        
+        **Example Request:**
+        ```bash
+        curl -X POST "http://your-server.com/cSbuFLhp/?api_key=8D3135D30437F86EAE2FA4A2A8345000&action=enable_line" \
+          -d "id=123"
+        ```
+        
+        **Use Cases:**
+        - ✅ Reactivate suspended accounts
+        - ✅ Resume service after payment
+        - ✅ Restore access
+      operationId: enableLine
+      tags:
+        - Line API
+      parameters:
+        - $ref: '#/components/parameters/ApiKey'
+        - name: action
+          in: query
+          required: true
+          schema:
+            type: string
+            enum: [enable_line]
+      requestBody:
+        required: true
+        content:
+          application/x-www-form-urlencoded:
+            schema:
+              type: object
+              required:
+                - id
+              properties:
+                id:
+                  type: integer
+                  description: Line ID to enable
+                  example: 123
+      responses:
+        '200':
+          description: Line enabled successfully
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/SuccessResponse'
+        '401':
+          $ref: '#/components/responses/Unauthorized'
+        '404':
+          $ref: '#/components/responses/NotFound'
+
+  /?action=disable_line:
+    post:
+      summary: Disable Line
+      description: |
+        Disables an active subscription line without deleting it.
+        
+        **Purpose:** Temporarily suspend access.
+        
+        ---
+        
+        **Example Request:**
+        ```bash
+        curl -X POST "http://your-server.com/cSbuFLhp/?api_key=8D3135D30437F86EAE2FA4A2A8345000&action=disable_line" \
+          -d "id=123"
+        ```
+        
+        **Use Cases:**
+        - ✅ Suspend non-payment accounts
+        - ✅ Temporarily block access
+        - ✅ Pause service
+      operationId: disableLine
+      tags:
+        - Line API
+      parameters:
+        - $ref: '#/components/parameters/ApiKey'
+        - name: action
+          in: query
+          required: true
+          schema:
+            type: string
+            enum: [disable_line]
+      requestBody:
+        required: true
+        content:
+          application/x-www-form-urlencoded:
+            schema:
+              type: object
+              required:
+                - id
+              properties:
+                id:
+                  type: integer
+                  description: Line ID to disable
+                  example: 123
+      responses:
+        '200':
+          description: Line disabled successfully
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/SuccessResponse'
+        '401':
+          $ref: '#/components/responses/Unauthorized'
+        '404':
+          $ref: '#/components/responses/NotFound'
+
+  /?action=ban_line:
+    post:
+      summary: Ban Line
+      description: |
+        Bans a subscription line, blocking access and preventing reactivation.
+        
+        **Purpose:** Permanently block abusive or fraudulent accounts.
+        
+        ---
+        
+        **Example Request:**
+        ```bash
+        curl -X POST "http://your-server.com/cSbuFLhp/?api_key=8D3135D30437F86EAE2FA4A2A8345000&action=ban_line" \
+          -d "id=123"
+        ```
+        
+        **Use Cases:**
+        - ✅ Block fraudulent accounts
+        - ✅ Prevent abuse
+        - ✅ Enforce terms of service
+      operationId: banLine
+      tags:
+        - Line API
+      parameters:
+        - $ref: '#/components/parameters/ApiKey'
+        - name: action
+          in: query
+          required: true
+          schema:
+            type: string
+            enum: [ban_line]
+      requestBody:
+        required: true
+        content:
+          application/x-www-form-urlencoded:
+            schema:
+              type: object
+              required:
+                - id
+              properties:
+                id:
+                  type: integer
+                  description: Line ID to ban
+                  example: 123
+      responses:
+        '200':
+          description: Line banned successfully
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/SuccessResponse'
+        '401':
+          $ref: '#/components/responses/Unauthorized'
+        '404':
+          $ref: '#/components/responses/NotFound'
+
+  /?action=unban_line:
+    post:
+      summary: Unban Line
+      description: |
+        Removes ban from a previously banned line.
+        
+        **Purpose:** Restore access to banned accounts.
+        
+        ---
+        
+        **Example Request:**
+        ```bash
+        curl -X POST "http://your-server.com/cSbuFLhp/?api_key=8D3135D30437F86EAE2FA4A2A8345000&action=unban_line" \
+          -d "id=123"
+        ```
+        
+        **Use Cases:**
+        - ✅ Unban false positives
+        - ✅ Restore access after appeal
+        - ✅ Second chances
+      operationId: unbanLine
+      tags:
+        - Line API
+      parameters:
+        - $ref: '#/components/parameters/ApiKey'
+        - name: action
+          in: query
+          required: true
+          schema:
+            type: string
+            enum: [unban_line]
+      requestBody:
+        required: true
+        content:
+          application/x-www-form-urlencoded:
+            schema:
+              type: object
+              required:
+                - id
+              properties:
+                id:
+                  type: integer
+                  description: Line ID to unban
+                  example: 123
+      responses:
+        '200':
+          description: Line unbanned successfully
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/SuccessResponse'
+        '401':
+          $ref: '#/components/responses/Unauthorized'
+        '404':
+          $ref: '#/components/responses/NotFound'
+
 components:
   securitySchemes:
     ApiKeyAuth: