osb/app/Models/Product/Domain.php

<?php

namespace App\Models\Product;

use Illuminate\Support\Collection;

use App\Interfaces\ProductItem;
use App\Models\Invoice;
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;

	// When comparing billing/pricing/charging, what metric to normalise to
	const DefaultBill = Invoice::BILL_YEARLY;
	// The model that the supplier supplies
	const SupplierModel = SupplierDomain::class;

	/* INTERFACES */

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

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

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