osb/app/Models/Product/Domain.php

<?php

namespace App\Models\Product;

use Illuminate\Support\Collection;

use App\Interfaces\ProductItem;
use App\Models\Service\Domain as ServiceDomain;
use App\Models\Supplier\Domain as SupplierDomain;

final class Domain extends Type implements ProductItem
{
	protected $table = 'product_domain';

	// Information required during the order process
	protected array $order_attributes = [
		'options.domain'=>[
			'request'=>'options.domain',
			'key'=>'domain_name',
			'validation'=>'required|min:3',
			'validation_message'=>'Domain Name is a required field.',
		],
		'options.tld_id'=>[
			'request'=>'options.tld_id',
			'key'=>'tld_id',
			'validation'=>'required|exists:tlds,id',
			'validation_message'=>'Domain TLD is a required field.',
		],
	];

	// The model that is referenced when this product is ordered
	protected string $order_model = ServiceDomain::class;

	/* RELATIONS */

	/**
	 * The offering supplied with this product
	 *
	 * @return \Illuminate\Database\Eloquent\Relations\HasOne
	 */
	public function supplied()
	{
		return $this->hasOne(SupplierDomain::class,'id','supplier_item_id');
	}

	/* INTERFACES */

	public function allowance(): Collection
	{
		// N/A
		return collect();
	}

	public function allowance_string(): string
	{
		// N/A
		return '';
	}

	public function getContractTermAttribute(): int
	{
		return 12;
	}

	public function getCostAttribute(): float
	{
		// N/A
		return 0;
	}

	public function getSupplierAttribute()
	{
		return '';
	}

	public function hasUsage(): bool
	{
		return FALSE;
	}
}