With AI, You Can Build That SaaS Multitenant Project with Subscription in Laravel

Why Multitenant Architecture for Your SaaS?

Building a SaaS (Software as a Service) application requires isolating each customer's data while sharing the same codebase. Laravel makes this achievable with multitenant architecture using subdomain routing.

The Core Setup: Subdomain Routing

Laravel's route groups can capture subdomains as parameters:

// routes/web.php
Route::domain('{subdomain}.' . config('app.domain'))->group(function () {
    Route::get('/dashboard', [DashboardController::class, 'index'])
        ->name('dashboard');
});

⚠️ Common Pitfall: URL Parameters vs Query Parameters

One of the biggest challenges in Laravel multitenancy is route parameter conflicts. When your subdomain is captured as the first route parameter, additional route parameters can accidentally override it!

❌ The Problem

// This causes issues - {id} may conflict with {subdomain}
Route::get('/users/{id}', [UserController::class, 'show']);

// Generated URL might replace subdomain incorrectly
route('users.show', ['id' => 5]); // Broken!

✅ The Solution: Use Query Parameters

// Use query parameters for dynamic values
Route::get('/users', [UserController::class, 'show'])
    ->name('users.show');

// In your controller
public function show(Request $request) {
    $user = User::findOrFail($request->query('id'));
    return view('users.show', compact('user'));
}

// Generate URL safely
route('users.show', ['subdomain' => $tenant->subdomain]) . '?id=5';

Database Per Tenant Pattern

For complete data isolation, create a separate database for each tenant:

// app/Http/Middleware/SetTenantDatabase.php
public function handle($request, Closure $next)
{
    $subdomain = $request->route('subdomain');
    $tenant = Tenant::where('subdomain', $subdomain)->first();
    
    Config::set('database.connections.tenant.database', $tenant->database);
    DB::purge('tenant');
    
    return $next($request);
}

Subscription Integration with Laravel Cashier

// Install Cashier for Stripe/Paddle
composer require laravel/cashier

// In your Tenant model
use Laravel\Cashier\Billable;

class Tenant extends Model
{
    use Billable;
}

Key Takeaways

• Use subdomain routing for tenant identification
• Prefer query parameters over route parameters to avoid conflicts
• Implement database-per-tenant for complete isolation
• Use Laravel Cashier for subscription billing
• Leverage AI tools like Cursor to accelerate development

With modern AI coding assistants, building a complete SaaS multitenant system is faster than ever. Start small, iterate quickly, and scale confidently!