Implement multi-tenancy support with OAuth2 authentication for tenant admins, Stripe integration for event purchases and credits ledger, new Filament resources for event purchases, updated API routes and middleware for tenant isolation and token guarding, added factories/seeders/migrations for new models (Tenant, EventPurchase, OAuth entities, etc.), enhanced tests, and documentation updates. Removed outdated DemoAchievementsSeeder.

app/Models/EventPurchase.php

@@ -0,0 +1,24 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+
+class EventPurchase extends Model
+{
+    use HasFactory;
+
+    protected $table = 'event_purchases';
+    protected $guarded = [];
+    protected $casts = [
+        'purchased_at' => 'datetime',
+        'amount' => 'decimal:2',
+    ];
+
+    public function tenant(): BelongsTo
+    {
+        return $this->belongsTo(Tenant::class);
+    }
+}