feat: Added SubscriptionController for managing su

app/Http/Controllers/SubscriptionController.php

@@ -0,0 +1,69 @@
+<?php
+
+namespace App\Http\Controllers;
+
+use Illuminate\Http\Request;
+use Illuminate\Support\Facades\Auth;
+use Laravel\Cashier\Exceptions\IncompletePayment;
+use Stripe\Stripe;
+use Stripe\Plan;
+
+class SubscriptionController extends Controller
+{
+    public function __construct()
+    {
+        Stripe::setApiKey(env('STRIPE_SECRET'));
+    }
+
+    public function viewAvailableSubscriptions()
+    {
+        $plans = Plan::all();
+        return response()->json(['plans' => $plans]);
+    }
+
+    public function subscribeToPlan(Request $request)
+    {
+        $request->validate([
+            'plan' => 'required|string',
+            'payment_method' => 'required|string',
+        ]);
+
+        $user = Auth::user();
+
+        try {
+            $user->newSubscription('default', $request->plan)
+                 ->create($request->payment_method);
+            return response()->json(['success' => true]);
+        } catch (IncompletePayment $exception) {
+            return response()->json(['success' => false, 'error' => $exception->getMessage()], 402);
+        }
+    }
+
+    public function changePlan(Request $request)
+    {
+        $request->validate([
+            'plan' => 'required|string',
+        ]);
+
+        $user = Auth::user();
+
+        try {
+            $user->subscription('default')->swap($request->plan);
+            return response()->json(['success' => true]);
+        } catch (\Exception $exception) {
+            return response()->json(['success' => false, 'error' => $exception->getMessage()], 400);
+        }
+    }
+
+    public function cancelSubscription()
+    {
+        $user = Auth::user();
+
+        try {
+            $user->subscription('default')->cancel();
+            return response()->json(['success' => true]);
+        } catch (\Exception $exception) {
+            return response()->json(['success' => false, 'error' => $exception->getMessage()], 400);
+        }
+    }
+}