1. TemporarySignature.php

<?php

class TemporarySignature implements TemporarySignatureInterface
{
    private string $hashKey;
    private int $ttl;

    /**
     * @param string $hashKey
     * @param int $ttl Время жизни токена в минутах
     */
    public function __construct(string $hashKey, int $ttl)
    {
        $this->hashKey = $hashKey;
        $this->ttl = $ttl;
    }

    public function generate($product, $price): string
    {
        $timestamp = Carbon::now()->addMinutes($this->ttl)->getTimestamp();

        // TIMESTAMP|SIGNATURE
        return $timestamp . '|' . $this->sign($product, $price, $timestamp);
    }

    public function isValid(string $signature, $product, $price): bool
    {
        if (empty($signature)) {
            return false;
        }

        if (strpos($signature, '|') === false) {
            return false;
        }

        [$timestamp, $signature] = explode('|', $signature, 2);

        return hash_equals($this->sign($product, $price, $timestamp), $signature) 
              && !$this->isExpired((int)$timestamp);
    }

    protected function sign($product, $price, int $timestamp): string
    {
        return hash_hmac('sha256', $product.$price . $timestamp, $this->hashKey);
    }

    protected function isExpired(int $timestamp): bool
    {
        return $timestamp < Carbon::now()->getTimestamp();
    }
}

2. AppServiceProvider.php

<?php
// Регистрируем сервис в ServiceProvider
class AppServiceProvider extends ServiceProvider
{
   public function register()
   {
      $this->app->singleton(
         TemporarySignatureInterface::class, 
         function () {
            return new TemporarySignature('secret-word', 10);
         }
      );
   }
}

3. ShowProductPriceAction.php

<?php
// И используем в контроллере
class ShowProductPriceAction extends Controller
{
    public function __invoke(TemporarySignatureInterface $signatureService) 
    {
       $product = 'abstract product';
       $price = '1000 RUB';
       $signature = $signatureService->generate($product, $price);
       return [
          'product' => $product,
          'price' => $price,
          'signature' => $hash
       ];
    }
}