<?php

namespace Modules\Core\Shipping\Contracts;

use Modules\Core\Shipping\Enums\ExtraService;

/**
 * A carrier that offers extra services (Saturday delivery, insurance, …).
 * Only the carrier knows its own codes — the rest of the app deals in the
 * normalized ExtraService cases.
 */
interface SupportsExtraServices
{
    /**
     * The services this carrier offers, keyed by ExtraService value, each
     * mapped to the carrier's own code.
     *
     * @return array<string, string>
     */
    public function extraServices(): array;
}