diff --git a/src/Service/PaymentsService.php b/src/Service/PaymentsService.php
index 4aec05d..c5a5d64 100644
--- a/src/Service/PaymentsService.php
+++ b/src/Service/PaymentsService.php
@@ -72,12 +72,21 @@ public function createPreauthorizedPayment(PreauthorizedPayment $payment)
 	/**
 	 * @param int|float $id
 	 * @param float $amount
+	 * @param array $items Use in case you need to refund payment with EET
+	 * @param array $eet Use in case you need to refund payment with EET
 	 * @return Response
 	 */
-	public function refundPayment($id, $amount)
+	public function refundPayment($id, $amount, $items = NULL, $eet = NULL)
 	{
-		// Make request
-		return $this->makeRequest('POST', 'payments/payment/' . $id . '/refund', ['amount' => round($amount * 100)], Http::CONTENT_FORM);
+		// without EET
+		if (is_null($items) || is_null($eet)) {
+			return $this->makeRequest('POST', 'payments/payment/' . $id . '/refund', ['amount' => round($amount * 100)], Http::CONTENT_FORM);
+		}
+
+		// with EET
+		$data = array_merge(['amount' => round($amount * 100)], ['items' => $items], ['eet' => $eet]);
+
+		return $this->makeRequest('POST', 'payments/payment/' . $id . '/refund', $data, Http::CONTENT_JSON);
 	}
 
 	/**
diff --git a/tests/cases/unit/Service/PaymentService.phpt b/tests/cases/unit/Service/PaymentService.phpt
index bab3a9f..386f261 100644
--- a/tests/cases/unit/Service/PaymentService.phpt
+++ b/tests/cases/unit/Service/PaymentService.phpt
@@ -8,10 +8,14 @@ use Markette\GopayInline\Api\Entity\Payment;
 use Markette\GopayInline\Api\Entity\PreauthorizedPayment;
 use Markette\GopayInline\Api\Entity\RecurrentPayment;
 use Markette\GopayInline\Api\Lists\Currency;
+use Markette\GopayInline\Api\Lists\PaymentType;
 use Markette\GopayInline\Api\Lists\TargetType;
+use Markette\GopayInline\Api\Objects\Eet;
+use Markette\GopayInline\Api\Objects\Item;
 use Markette\GopayInline\Api\Objects\Target;
 use Markette\GopayInline\Client;
 use Markette\GopayInline\Config;
+use Markette\GopayInline\Http\Http;
 use Markette\GopayInline\Service\PaymentsService;
 use Tester\Assert;
 
@@ -112,3 +116,68 @@ test(function () {
 	Assert::equal(100, $payment->getAmount());
 	Assert::equal(99, $payment->getTarget()->goid);
 });
+
+// Refund payment
+test(function () {
+	$client = new Client(new Config(1, 2, 3));
+	$service = Mockery::mock(PaymentsService::class, [$client])
+		->makePartial()
+		->shouldAllowMockingProtectedMethods();
+	$service->shouldReceive('makeRequest')
+		->with('POST', 'payments/payment/99/refund', ['amount' => (float) 12345], Http::CONTENT_FORM)
+		->andReturn(TRUE);
+
+	Assert::true($service->refundPayment(99, 123.45));
+});
+
+// Refund payment when EET is defined, see https://doc.gopay.com/cs/#refundace-platby-(storno)24
+test(function () {
+	$item = new Item();
+	$item->setType(PaymentType::ITEM);
+	$item->setName('lodicky');
+	// $item->setProductUrl not implemented yet
+	// $item->setEan not implemented yet
+	$item->setAmount(-1199.90);
+	$item->setCount(1);
+	$item->setVatRate(21);
+	$items = [$item->toArray()];
+
+	$eet = new Eet();
+	$eet->setSum(-1199.90);
+	$eet->setTaxBase(-991.65);
+	$eet->setTax(-208.25);
+	$eet->setCurrency(Currency::CZK);
+	$eet = $eet->toArray();
+
+	$client = new Client(new Config(1, 2, 3));
+	$service = Mockery::mock(PaymentsService::class, [$client])
+		->makePartial()
+		->shouldAllowMockingProtectedMethods();
+	$service->shouldReceive('makeRequest')
+		->with(
+			'POST',
+			'payments/payment/99/refund',
+			[
+				'amount' => (float) 119990,
+				'items' => [[
+					'type' => 'ITEM',
+					'name' => 'lodicky',
+					//'product_url' => 'https://www.eshop.cz/boty/damske/lodicky-cervene',
+					//'ean' => 1234567890123,
+					'amount' => (float) - 119990,
+					'count' => 1,
+					'vat_rate' => 21,
+				]],
+				'eet' => [
+					'celk_trzba' => (float) - 119990,
+					'zakl_dan1' => (float) - 99165,
+					'dan1' => (float) - 20825,
+					'mena' => Currency::CZK,
+				],
+			],
+			Http::CONTENT_JSON
+		)
+		->andReturn(TRUE);
+
+	Assert::true($service->refundPayment(99, 1199.90, $items, $eet));
+});