feat: Add Subscription model with Laravel Cashier

app/Models/Subscription.php

@@ -0,0 +1,39 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+use Laravel\Cashier\Billable;
+
+class Subscription extends Model
+{
+    use Billable;
+
+    protected $fillable = [
+        'name', 'stripe_id', 'stripe_status', 'stripe_plan', 'quantity', 'trial_ends_at', 'ends_at',
+    ];
+
+    public function user()
+    {
+        return $this->belongsTo(User::class);
+    }
+
+    public function isActive()
+    {
+        return $this->stripe_status === 'active';
+    }
+
+    public function cancel()
+    {
+        $this->subscription('default')->cancel();
+    }
+
+    public function renew()
+    {
+        if ($this->onGracePeriod()) {
+            $this->subscription('default')->resume();
+        } else {
+            // Handle logic for subscriptions that are not in grace period
+        }
+    }
+}