diff --git a/README.md b/README.md
index 0be9a19..af22d74 100644
--- a/README.md
+++ b/README.md
@@ -1,84 +1,184 @@
-# composer package for using bitunix api trading
+# Laravel Bitunix API Package
 
-[![Latest Version on Packagist](https://img.shields.io/packagist/v/mahdimsr/laravel-bitunix-api.svg?style=flat-square)](https://packagist.org/packages/mahdimsr/laravel-bitunix-api)
-[![GitHub Tests Action Status](https://img.shields.io/github/actions/workflow/status/mahdimsr/laravel-bitunix-api/run-tests.yml?branch=main&label=tests&style=flat-square)](https://github.com/mahdimsr/laravel-bitunix-api/actions?query=workflow%3Arun-tests+branch%3Amain)
-[![GitHub Code Style Action Status](https://img.shields.io/github/actions/workflow/status/mahdimsr/laravel-bitunix-api/fix-php-code-style-issues.yml?branch=main&label=code%20style&style=flat-square)](https://github.com/mahdimsr/laravel-bitunix-api/actions?query=workflow%3A"Fix+PHP+code+style+issues"+branch%3Amain)
-[![Total Downloads](https://img.shields.io/packagist/dt/mahdimsr/laravel-bitunix-api.svg?style=flat-square)](https://packagist.org/packages/mahdimsr/laravel-bitunix-api)
-
-This is where your description should go. Limit it to a paragraph or two. Consider adding a small example.
-
-## Support us
-
-[<img src="https://github-ads.s3.eu-central-1.amazonaws.com/laravel-bitunix-api.jpg?t=1" width="419px" />](https://spatie.be/github-ad-click/laravel-bitunix-api)
-
-We invest a lot of resources into creating [best in class open source packages](https://spatie.be/open-source). You can support us by [buying one of our paid products](https://spatie.be/open-source/support-us).
-
-We highly appreciate you sending us a postcard from your hometown, mentioning which of our package(s) you are using. You'll find our address on [our contact page](https://spatie.be/about-us). We publish all received postcards on [our virtual postcard wall](https://spatie.be/open-source/postcards).
+A Laravel package for interacting with the Bitunix cryptocurrency exchange API.
 
 ## Installation
 
-You can install the package via composer:
-
 ```bash
-composer require mahdimsr/laravel-bitunix-api
+composer require msr/laravel-bitunix-api
 ```
 
-You can publish and run the migrations with:
+## Configuration
 
-```bash
-php artisan vendor:publish --tag="laravel-bitunix-api-migrations"
-php artisan migrate
+### 1. Environment Variables
+
+Add the following variables to your `.env` file:
+
+```env
+BITUNIX_API_KEY=your-api-key-here
+BITUNIX_API_SECRET=your-api-secret-here
+BITUNIX_LANGUAGE=en-US
 ```
 
-You can publish the config file with:
+### 2. Publish Configuration (Optional)
 
 ```bash
-php artisan vendor:publish --tag="laravel-bitunix-api-config"
+php artisan vendor:publish --tag=bitunix-api-config
 ```
 
-This is the contents of the published config file:
+### 3. Verify Configuration
 
-```php
-return [
-];
-```
-
-Optionally, you can publish the views using
+Run the configuration check script:
 
 ```bash
-php artisan vendor:publish --tag="laravel-bitunix-api-views"
+php scripts/check-config.php
 ```
 
 ## Usage
 
+### Change Leverage
+
 ```php
-$laravelBitunixApi = new Msr\LaravelBitunixApi();
-echo $laravelBitunixApi->echoPhrase('Hello, Msr!');
+use Msr\LaravelBitunixApi\Requests\ChangeLeverageRequestContract;
+
+$api = app(ChangeLeverageRequestContract::class);
+$response = $api->changeLeverage('BTCUSDT', 'USDT', 12);
+
+if ($response->getStatusCode() === 200) {
+    $data = json_decode($response->getBody()->getContents(), true);
+    if ($data['code'] === 0) {
+        echo "Leverage changed successfully!";
+    }
+}
+```
+
+### Change Margin Mode
+
+```php
+use Msr\LaravelBitunixApi\Requests\ChangeMarginModeRequestContract;
+
+$api = app(ChangeMarginModeRequestContract::class);
+$response = $api->changeMarginMode('BTCUSDT', 'USDT', 'ISOLATION');
+
+if ($response->getStatusCode() === 200) {
+    $data = json_decode($response->getBody()->getContents(), true);
+    if ($data['code'] === 0) {
+        echo "Margin mode changed successfully!";
+    }
+}
+```
+
+### Get Future Kline Data
+
+```php
+use Msr\LaravelBitunixApi\Requests\FutureKLineRequestContract;
+
+$api = app(FutureKLineRequestContract::class);
+$response = $api->getFutureKline('BTCUSDT', '1h', 100);
+
+if ($response->getStatusCode() === 200) {
+    $data = json_decode($response->getBody()->getContents(), true);
+    // Process kline data
+}
+```
+
+## API Methods
+
+### Account Management
+
+- `changeLeverage(string $symbol, string $marginCoin, int $leverage)` - Change leverage
+- `changeMarginMode(string $symbol, string $marginCoin, string $marginMode)` - Change margin mode
+
+### Market Data
+
+- `getFutureKline(string $symbol, string $interval, int $limit, ?int $startTime, ?int $endTime, string $type)` - Get kline data
+
+## Configuration Options
+
+| Option | Description | Default |
+|--------|-------------|---------|
+| `future_base_uri` | Bitunix API base URI | `https://fapi.bitunix.com/` |
+| `api_key` | Your API key | From `BITUNIX_API_KEY` env var |
+| `api_secret` | Your API secret | From `BITUNIX_API_SECRET` env var |
+| `language` | API language | From `BITUNIX_LANGUAGE` env var or `en-US` |
+
+## Rate Limits
+
+- **Change Leverage**: 10 req/sec/uid
+- **Change Margin Mode**: 10 req/sec/uid
+
+## Error Handling
+
+All methods return a `ResponseInterface` object. Check the response status and parse the JSON response:
+
+```php
+$response = $api->changeLeverage('BTCUSDT', 'USDT', 12);
+
+if ($response->getStatusCode() === 200) {
+    $data = json_decode($response->getBody()->getContents(), true);
+    
+    if ($data['code'] === 0) {
+        // Success
+        echo "Operation successful: " . $data['msg'];
+    } else {
+        // API Error
+        echo "API Error: " . $data['msg'];
+    }
+} else {
+    // HTTP Error
+    echo "HTTP Error: " . $response->getStatusCode();
+}
 ```
 
 ## Testing
 
+Run the test suite:
+
 ```bash
-composer test
+vendor/bin/pest
 ```
 
-## Changelog
+Run specific tests:
 
-Please see [CHANGELOG](CHANGELOG.md) for more information on what has changed recently.
+```bash
+vendor/bin/pest tests/ChangeLeverageTest.php
+vendor/bin/pest tests/ChangeMarginModeTest.php
+vendor/bin/pest tests/HeaderTest.php
+```
 
-## Contributing
+## Examples
 
-Please see [CONTRIBUTING](CONTRIBUTING.md) for details.
+See the `examples/` directory for complete usage examples:
 
-## Security Vulnerabilities
+- `ChangeLeverageExample.php`
+- `ChangeMarginModeExample.php`
 
-Please review [our security policy](../../security/policy) on how to report security vulnerabilities.
+## Troubleshooting
 
-## Credits
+### API credentials not loading from .env
 
-- [mahdi mansouri](https://github.com/mahdimsr)
-- [All Contributors](../../contributors)
+1. Make sure your `.env` file is in the project root
+2. Check that the variable names match exactly (case-sensitive)
+3. Restart your application/server after changing .env
+4. Clear config cache: `php artisan config:clear`
+
+### Signature generation fails
+
+1. Verify API key and secret are correct
+2. Check that the credentials have the necessary permissions
+3. Ensure your system time is synchronized
+
+## Security
+
+- Never commit API credentials to version control
+- Use environment variables for all sensitive data
+- Restrict API key permissions to minimum required
+- Regularly rotate API keys
 
 ## License
 
-The MIT License (MIT). Please see [License File](LICENSE.md) for more information.
+MIT License. See LICENSE file for details.
+
+## Support
+
+For issues and questions, please create an issue on the GitHub repository.
\ No newline at end of file
diff --git a/examples/ChangeMarginModeExample.php b/examples/ChangeMarginModeExample.php
new file mode 100644
index 0000000..47778e8
--- /dev/null
+++ b/examples/ChangeMarginModeExample.php
@@ -0,0 +1,65 @@
+<?php
+
+/**
+ * Example usage of Change Margin Mode functionality
+ *
+ * This example demonstrates how to use the LaravelBitunixApi package
+ * to change margin mode for a trading pair on Bitunix exchange.
+ */
+
+require_once __DIR__.'/../vendor/autoload.php';
+
+use Msr\LaravelBitunixApi\Requests\ChangeMarginModeRequestContract;
+
+// Example configuration (in real usage, these would be in your .env file)
+config([
+    'bitunix-api.future_base_uri' => 'https://fapi.bitunix.com/',
+    'bitunix-api.api_key' => 'your-api-key-here',
+    'bitunix-api.api_secret' => 'your-api-secret-here',
+    'bitunix-api.language' => 'en-US',
+]);
+
+try {
+    // Get the API instance
+    $api = app(ChangeMarginModeRequestContract::class);
+
+    // Change margin mode for BTCUSDT pair
+    $symbol = 'BTCUSDT';
+    $marginCoin = 'USDT';
+    $marginMode = 'ISOLATION'; // or 'CROSS'
+
+    echo "Changing margin mode for {$symbol} to {$marginMode}...\n";
+
+    $response = $api->changeMarginMode($symbol, $marginCoin, $marginMode);
+
+    // Check response status
+    if ($response->getStatusCode() === 200) {
+        $data = json_decode($response->getBody()->getContents(), true);
+
+        if ($data['code'] === 0) {
+            echo "✅ Margin mode changed successfully!\n";
+            echo 'Symbol: '.$data['data'][0]['symbol']."\n";
+            echo 'Margin Coin: '.$data['data'][0]['marginCoin']."\n";
+            echo 'Margin Mode: '.$data['data'][0]['marginMode']."\n";
+        } else {
+            echo '❌ API Error: '.$data['msg']."\n";
+        }
+    } else {
+        echo '❌ HTTP Error: '.$response->getStatusCode()."\n";
+    }
+
+} catch (Exception $e) {
+    echo '❌ Exception: '.$e->getMessage()."\n";
+}
+
+/**
+ * Available Margin Modes:
+ * - ISOLATION: Isolated margin mode
+ * - CROSS: Cross margin mode
+ *
+ * Environment Variables Required:
+ *
+ * BITUNIX_API_KEY=your-api-key
+ * BITUNIX_API_SECRET=your-api-secret
+ * BITUNIX_LANGUAGE=en-US
+ */
diff --git a/scripts/check-config.php b/scripts/check-config.php
new file mode 100644
index 0000000..deed70a
--- /dev/null
+++ b/scripts/check-config.php
@@ -0,0 +1,81 @@
+<?php
+
+/**
+ * Configuration Check Script
+ * 
+ * This script helps you verify that your Bitunix API configuration is working correctly.
+ */
+
+require_once __DIR__ . '/../vendor/autoload.php';
+
+use Msr\LaravelBitunixApi\Requests\Header;
+
+echo "🔍 Checking Bitunix API Configuration...\n\n";
+
+// Check if .env file exists
+$envFile = __DIR__ . '/../.env';
+if (!file_exists($envFile)) {
+    echo "❌ .env file not found. Please create one based on .env.example\n";
+    exit(1);
+}
+
+// Load environment variables
+if (file_exists($envFile)) {
+    $lines = file($envFile, FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES);
+    foreach ($lines as $line) {
+        if (strpos($line, '=') !== false && strpos($line, '#') !== 0) {
+            list($key, $value) = explode('=', $line, 2);
+            putenv(trim($key) . '=' . trim($value));
+        }
+    }
+}
+
+// Check environment variables
+$apiKey = getenv('BITUNIX_API_KEY');
+$apiSecret = getenv('BITUNIX_API_SECRET');
+$language = getenv('BITUNIX_LANGUAGE') ?: 'en-US';
+
+echo "📋 Environment Variables:\n";
+echo "  BITUNIX_API_KEY: " . (empty($apiKey) ? "❌ Not set" : "✅ Set (" . substr($apiKey, 0, 8) . "...)") . "\n";
+echo "  BITUNIX_API_SECRET: " . (empty($apiSecret) ? "❌ Not set" : "✅ Set (" . substr($apiSecret, 0, 8) . "...)") . "\n";
+echo "  BITUNIX_LANGUAGE: " . ($language) . "\n\n";
+
+if (empty($apiKey) || empty($apiSecret)) {
+    echo "❌ API credentials not configured properly.\n";
+    echo "Please set BITUNIX_API_KEY and BITUNIX_API_SECRET in your .env file.\n";
+    exit(1);
+}
+
+// Test configuration loading
+config([
+    'bitunix-api.future_base_uri' => 'https://fapi.bitunix.com/',
+    'bitunix-api.api_key' => $apiKey,
+    'bitunix-api.api_secret' => $apiSecret,
+    'bitunix-api.language' => $language,
+]);
+
+echo "🔧 Configuration Test:\n";
+echo "  Base URI: " . config('bitunix-api.future_base_uri') . "\n";
+echo "  API Key: " . substr(config('bitunix-api.api_key'), 0, 8) . "...\n";
+echo "  API Secret: " . substr(config('bitunix-api.api_secret'), 0, 8) . "...\n";
+echo "  Language: " . config('bitunix-api.language') . "\n\n";
+
+// Test header generation
+try {
+    echo "🔐 Testing Header Generation:\n";
+    $headers = Header::generateHeaders([], '{"test":"value"}');
+    
+    echo "  API Key: " . $headers['api-key'] . "\n";
+    echo "  Sign: " . substr($headers['sign'], 0, 16) . "...\n";
+    echo "  Nonce: " . $headers['nonce'] . "\n";
+    echo "  Timestamp: " . $headers['timestamp'] . "\n";
+    echo "  Language: " . $headers['language'] . "\n";
+    echo "  Content-Type: " . $headers['Content-Type'] . "\n\n";
+    
+    echo "✅ Configuration is working correctly!\n";
+    echo "You can now use the Bitunix API package in your application.\n";
+    
+} catch (Exception $e) {
+    echo "❌ Error generating headers: " . $e->getMessage() . "\n";
+    exit(1);
+}
diff --git a/src/LaravelBitunixApi.php b/src/LaravelBitunixApi.php
index eb2fe77..d4aa5a5 100644
--- a/src/LaravelBitunixApi.php
+++ b/src/LaravelBitunixApi.php
@@ -4,11 +4,12 @@ namespace Msr\LaravelBitunixApi;
 
 use GuzzleHttp\Client;
 use Msr\LaravelBitunixApi\Requests\ChangeLeverageRequestContract;
+use Msr\LaravelBitunixApi\Requests\ChangeMarginModeRequestContract;
 use Msr\LaravelBitunixApi\Requests\FutureKLineRequestContract;
 use Msr\LaravelBitunixApi\Requests\Header;
 use Psr\Http\Message\ResponseInterface;
 
-class LaravelBitunixApi implements ChangeLeverageRequestContract, FutureKLineRequestContract
+class LaravelBitunixApi implements ChangeLeverageRequestContract, ChangeMarginModeRequestContract, FutureKLineRequestContract
 {
     private Client $publicFutureClient;
 
@@ -60,4 +61,19 @@ class LaravelBitunixApi implements ChangeLeverageRequestContract, FutureKLineReq
 
         return $response;
     }
+
+    public function changeMarginMode(string $symbol, string $marginCoin, string $marginMode): ResponseInterface
+    {
+        $body = [
+            'symbol' => $symbol,
+            'marginCoin' => $marginCoin,
+            'marginMode' => $marginMode,
+        ];
+
+        $response = $this->getPrivateFutureClient([], $body)->post('account/change_margin_mode', [
+            'json' => $body,
+        ]);
+
+        return $response;
+    }
 }
diff --git a/src/LaravelBitunixApiServiceProvider.php b/src/LaravelBitunixApiServiceProvider.php
index 589a68b..4161e5d 100644
--- a/src/LaravelBitunixApiServiceProvider.php
+++ b/src/LaravelBitunixApiServiceProvider.php
@@ -4,6 +4,7 @@ namespace Msr\LaravelBitunixApi;
 
 use Msr\LaravelBitunixApi\Commands\LaravelBitunixApiCommand;
 use Msr\LaravelBitunixApi\Requests\ChangeLeverageRequestContract;
+use Msr\LaravelBitunixApi\Requests\ChangeMarginModeRequestContract;
 use Msr\LaravelBitunixApi\Requests\FutureKLineRequestContract;
 use Spatie\LaravelPackageTools\Package;
 use Spatie\LaravelPackageTools\PackageServiceProvider;
@@ -31,5 +32,6 @@ class LaravelBitunixApiServiceProvider extends PackageServiceProvider
 
         $this->app->bind(FutureKLineRequestContract::class, LaravelBitunixApi::class);
         $this->app->bind(ChangeLeverageRequestContract::class, LaravelBitunixApi::class);
+        $this->app->bind(ChangeMarginModeRequestContract::class, LaravelBitunixApi::class);
     }
 }
diff --git a/src/Requests/ChangeMarginModeRequestContract.php b/src/Requests/ChangeMarginModeRequestContract.php
new file mode 100644
index 0000000..3f2b6c9
--- /dev/null
+++ b/src/Requests/ChangeMarginModeRequestContract.php
@@ -0,0 +1,18 @@
+<?php
+
+namespace Msr\LaravelBitunixApi\Requests;
+
+use Psr\Http\Message\ResponseInterface;
+
+interface ChangeMarginModeRequestContract
+{
+    /**
+     * Change margin mode for a trading pair
+     *
+     * @param string $symbol Trading pair (e.g., 'BTCUSDT')
+     * @param string $marginCoin Margin coin (e.g., 'USDT')
+     * @param string $marginMode Margin mode ('ISOLATION' or 'CROSS')
+     * @return ResponseInterface
+     */
+    public function changeMarginMode(string $symbol, string $marginCoin, string $marginMode): ResponseInterface;
+}
diff --git a/tests/ChangeMarginModeTest.php b/tests/ChangeMarginModeTest.php
new file mode 100644
index 0000000..7ffa918
--- /dev/null
+++ b/tests/ChangeMarginModeTest.php
@@ -0,0 +1,96 @@
+<?php
+
+use Msr\LaravelBitunixApi\Requests\ChangeMarginModeRequestContract;
+
+beforeEach(function () {
+    config([
+        'bitunix-api.future_base_uri' => 'https://fapi.bitunix.com/',
+        'bitunix-api.api_key' => 'test-api-key',
+        'bitunix-api.api_secret' => 'test-secret-key',
+        'bitunix-api.language' => 'en-US',
+    ]);
+});
+
+it('can change margin mode successfully', function () {
+    $api = app(ChangeMarginModeRequestContract::class);
+
+    expect(fn() => $api->changeMarginMode('BTCUSDT', 'USDT', 'ISOLATION'))
+        ->not->toThrow(Exception::class)
+        ->and(fn() => $api->changeMarginMode('BTCUSDT', 'USDT', 'CROSS'))
+        ->not->toThrow(Exception::class);
+
+});
+
+it('validates required parameters for change margin mode', function () {
+    $api = app(ChangeMarginModeRequestContract::class);
+
+    expect(fn() => $api->changeMarginMode('BTCUSDT', 'USDT', 'ISOLATION'))
+        ->not->toThrow(Exception::class)
+        ->and(fn() => $api->changeMarginMode('ETHUSDT', 'USDT', 'CROSS'))
+        ->not->toThrow(Exception::class);
+
+});
+
+it('handles different margin modes correctly', function () {
+    $api = app(ChangeMarginModeRequestContract::class);
+
+    $marginModes = ['ISOLATION', 'CROSS'];
+
+    foreach ($marginModes as $mode) {
+        expect(fn () => $api->changeMarginMode('BTCUSDT', 'USDT', $mode))
+            ->not->toThrow(Exception::class);
+    }
+});
+
+it('validates margin mode parameter values', function () {
+    $api = app(ChangeMarginModeRequestContract::class);
+
+    expect(fn() => $api->changeMarginMode('BTCUSDT', 'USDT', 'ISOLATION'))
+        ->not->toThrow(Exception::class)
+        ->and(fn() => $api->changeMarginMode('BTCUSDT', 'USDT', 'CROSS'))
+        ->not->toThrow(Exception::class);
+
+});
+
+it('can handle different trading pairs', function () {
+    $api = app(ChangeMarginModeRequestContract::class);
+
+    $tradingPairs = ['BTCUSDT', 'ETHUSDT', 'ADAUSDT'];
+
+    foreach ($tradingPairs as $symbol) {
+        expect(fn () => $api->changeMarginMode($symbol, 'USDT', 'ISOLATION'))
+            ->not->toThrow(Exception::class);
+    }
+});
+
+it('can handle different margin coins', function () {
+    $api = app(ChangeMarginModeRequestContract::class);
+
+    $marginCoins = ['USDT', 'BTC', 'ETH'];
+
+    foreach ($marginCoins as $coin) {
+        expect(fn () => $api->changeMarginMode('BTCUSDT', $coin, 'ISOLATION'))
+            ->not->toThrow(Exception::class);
+    }
+});
+
+it('validates margin mode constants', function () {
+    $api = app(ChangeMarginModeRequestContract::class);
+
+    $validModes = ['ISOLATION', 'CROSS'];
+
+    foreach ($validModes as $mode) {
+        expect(fn () => $api->changeMarginMode('BTCUSDT', 'USDT', $mode))
+            ->not->toThrow(Exception::class);
+    }
+});
+
+it('handles edge cases for margin mode', function () {
+    $api = app(ChangeMarginModeRequestContract::class);
+
+    expect(fn() => $api->changeMarginMode('BTCUSDT', 'USDT', 'ISOLATION'))
+        ->not->toThrow(Exception::class)
+        ->and(fn() => $api->changeMarginMode('ETHUSDT', 'USDT', 'CROSS'))
+        ->not->toThrow(Exception::class);
+
+});