wip

app/Models/Payment/ApiKeyHalkbank.php

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+<?php
+
+namespace App\Models\Payment;
+
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+
+class ApiKeyHalkbank extends Model
+{
+    use HasFactory;
+
+    /**
+     * Table name
+     *
+     * @var string
+     */
+    protected $table = 'api_key_halkbank';
+
+    /**
+     * The attributes that are mass assignable.
+     *
+     * @var array<int, string>
+     */
+    protected $fillable = [
+        'order_number',
+        'billing_username',
+        'billing_password',
+    ];
+
+    /**
+     * Generate unique order number
+     */
+    public static function generateOrderNumber($resource): int
+    {
+        $order_number = static::firstOrCreate([
+            'billing_username' => $resource->billing_username ?? 'asdasd',
+            'billing_password' => $resource->billing_password ?? 'asdasd',
+        ], ['order_number' => '01122017270']);
+
+        $order_number->update([
+            'order_number' => $order_number->order_number + 1,
+        ]);
+
+        return $order_number->order_number;
+    }
+}