Бросаем исключение, если калькулятр доставки вернул нулевую стоимость

src/Dispatching/Endpoints/Services/Exceptions/CalculationException.php

@@ -0,0 +1,24 @@
+<?php
+
+/**
+ * This file is part of RussianPost SDK package.
+ *
+ * © Appwilio (http://appwilio.com), greabock (https://github.com/greabock), JhaoDa (https://github.com/jhaoda)
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+declare(strict_types=1);
+
+namespace Appwilio\RussianPostSDK\Dispatching\Endpoints\Services\Exceptions;
+
+final class CalculationException extends \DomainException
+{
+    public const ZERO_TOTAL_RATE = 1;
+
+    public static function becauseZeroTotalRate(): self
+    {
+        return new self('Почта России вернула нулевой расчёт стоимости доставки.', self::ZERO_TOTAL_RATE);
+    }
+}

src/Dispatching/Endpoints/Services/Services.php

@@ -25,6 +25,7 @@
 use Appwilio\RussianPostSDK\Dispatching\Endpoints\Services\Requests\NormalizeFioRequest;
 use Appwilio\RussianPostSDK\Dispatching\Endpoints\Services\Requests\NormalizePhoneRequest;
 use Appwilio\RussianPostSDK\Dispatching\Endpoints\Services\Requests\CheckRecipientRequest;
+use Appwilio\RussianPostSDK\Dispatching\Endpoints\Services\Exceptions\CalculationException;
 use Appwilio\RussianPostSDK\Dispatching\Endpoints\Services\Requests\NormalizeAddressRequest;
 
 final class Services
@@ -90,7 +91,14 @@ public function normalizeAddress(NormalizeAddressRequest $request): iterable
      */
     public function calculate(CalculationRequest $request): Calculation
     {
-        return $this->client->post('/1.0/tariff', $request, Calculation::class);
+        /** @var Calculation $calculation */
+        $calculation = $this->client->post('/1.0/tariff', $request, Calculation::class);
+
+        if ($calculation->getTotal()->getRate() === 0) {
+            throw CalculationException::becauseZeroTotalRate();
+        }
+
+        return $calculation;
     }
 
     /**