feat(ticket): implement ticket generation on purchase payment and add related tests

app/Domains/Purchase/Models/Purchase.php

@@ -4,6 +4,7 @@ namespace App\Domains\Purchase\Models;
 
 use App\Domains\Auth\Models\User;
 use App\Domains\Cart\Models\Cart;
+use App\Domains\Purchase\Events\PurchasePaid;
 use App\Domains\Tenant\Models\Tenant;
 use Illuminate\Database\Eloquent\Attributes\Fillable;
 use Illuminate\Database\Eloquent\Factories\HasFactory;
@@ -11,6 +12,7 @@ use Illuminate\Database\Eloquent\Model;
 use Illuminate\Database\Eloquent\Relations\BelongsTo;
 use Illuminate\Database\Eloquent\Relations\HasMany;
 use Illuminate\Database\Eloquent\Relations\HasOne;
+use Illuminate\Support\Facades\DB;
 
 #[Fillable([
     'cart_id',
@@ -137,8 +139,23 @@ class Purchase extends Model
 
     public function markAsPaid(): void
     {
-        $this->update([
-            'status' => self::STATUS_PAID,
-        ]);
+        DB::transaction(function (): void {
+            $currentStatus = self::query()
+                ->whereKey($this->getKey())
+                ->lockForUpdate()
+                ->value('status');
+
+            if ($currentStatus === self::STATUS_PAID) {
+                $this->status = self::STATUS_PAID;
+
+                return;
+            }
+
+            $this->update([
+                'status' => self::STATUS_PAID,
+            ]);
+
+            PurchasePaid::dispatch($this);
+        });
     }
 }