webmoney/backend/app/Models/SiteSetting.php

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;

class SiteSetting extends Model
{
    protected $fillable = [
        'key',
        'value',
        'description',
    ];

    protected $casts = [
        'value' => 'array',
    ];

    /**
     * Get a setting value by key
     */
    public static function getValue(string $key, $default = null)
    {
        $setting = static::where('key', $key)->first();
        
        if (!$setting) {
            return $default;
        }

        // If value is a simple string stored as JSON array, extract it
        $value = $setting->value;
        if (is_array($value) && isset($value['value'])) {
            return $value['value'];
        }

        return $value ?? $default;
    }

    /**
     * Set a setting value by key
     */
    public static function setValue(string $key, $value, string $description = null): self
    {
        return static::updateOrCreate(
            ['key' => $key],
            [
                'value' => is_array($value) ? $value : ['value' => $value],
                'description' => $description,
            ]
        );
    }
}