future-private: add change margin mode request

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
+ */