CreatePayWithIyzicoInitializeRequest returns null

[thekavak]

Hello, I wanted to take the PWI sample as it is and try it using the samples, but all the results are null.

İyzico response
Iyzipay\Model\PayWithIyzicoInitialize {#1391 ▼ // app\Http\PaymentGateways\Gateways\Iyzico.php:202
-rawResult: false
-status: null
-errorCode: null
-errorMessage: null
-errorGroup: null
-locale: null
-systemTime: null
-conversationId: null
-token: null
-payWithIyzicoContent: null
-tokenExpireTime: null
-payWithIyzicoPageUrl: null
-signature: null
}

Also when I tried on postman with url: https://api.iyzipay.com/payment/pay-with-iyzico/initialize

it response to :
{
"status": "failure",
"errorCode": "1007",
"errorMessage": "Signature gönderilmesi zorunludur",
"locale": "tr",
"systemTime": 1736847768987,
"conversationId": "conversationID"
}

I have looked in many places, but I interpreted the signature as a data that should come from the API, not something I should send. I would be happy if you could help.

Here laravel code:

`

      $request = new \Iyzipay\Request\CreatePayWithIyzicoInitializeRequest();
        $request->setLocale(\Iyzipay\Model\Locale::TR);
        $request->setConversationId("123456789");
        $request->setPrice("1");
        $request->setPaidPrice("1.2");
        $request->setCurrency(\Iyzipay\Model\Currency::TL);
        $request->setBasketId("B67832");
        $request->setPaymentGroup(\Iyzipay\Model\PaymentGroup::PRODUCT);
        $request->setCallbackUrl("https://www.merchant.com/callback");
        $request->setEnabledInstallments(array(2, 3, 6, 9));

        $buyer = new \Iyzipay\Model\Buyer();
        $buyer->setId("BY789");
        $buyer->setName("John");
        $buyer->setSurname("Doe");
        $buyer->setGsmNumber("+905350000000");
        $buyer->setEmail("email@email.com");
        $buyer->setIdentityNumber("74300864791");
        $buyer->setLastLoginDate("2015-10-05 12:43:35");
        $buyer->setRegistrationDate("2013-04-21 15:12:09");
        $buyer->setRegistrationAddress("Nidakule Göztepe, Merdivenköy Mah. Bora Sok. No:1");
        $buyer->setIp("85.34.78.112");
        $buyer->setCity("Istanbul");
        $buyer->setCountry("Turkey");
        $buyer->setZipCode("34732");
        $request->setBuyer($buyer);

        $shippingAddress = new \Iyzipay\Model\Address();
        $shippingAddress->setContactName("Jane Doe");
        $shippingAddress->setCity("Istanbul");
        $shippingAddress->setCountry("Turkey");
        $shippingAddress->setAddress("Nidakule Göztepe, Merdivenköy Mah. Bora Sok. No:1");
        $shippingAddress->setZipCode("34742");
        $request->setShippingAddress($shippingAddress);
        
        $billingAddress = new \Iyzipay\Model\Address();
        $billingAddress->setContactName("Jane Doe");
        $billingAddress->setCity("Istanbul");
        $billingAddress->setCountry("Turkey");
        $billingAddress->setAddress("Nidakule Göztepe, Merdivenköy Mah. Bora Sok. No:1");
        $billingAddress->setZipCode("34742");
        $request->setBillingAddress($billingAddress);
        
        $basketItems = array();
        $firstBasketItem = new \Iyzipay\Model\BasketItem();
        $firstBasketItem->setId("BI101");
        $firstBasketItem->setName("Binocular");
        $firstBasketItem->setCategory1("Collectibles");
        $firstBasketItem->setCategory2("Accessories");
        $firstBasketItem->setItemType(\Iyzipay\Model\BasketItemType::PHYSICAL);
        $firstBasketItem->setPrice("0.3");
        $basketItems[0] = $firstBasketItem;
        
        $secondBasketItem = new \Iyzipay\Model\BasketItem();
        $secondBasketItem->setId("BI102");
        $secondBasketItem->setName("Game code");
        $secondBasketItem->setCategory1("Game");
        $secondBasketItem->setCategory2("Online Game Items");
        $secondBasketItem->setItemType(\Iyzipay\Model\BasketItemType::VIRTUAL);
        $secondBasketItem->setPrice("0.5");
        $basketItems[1] = $secondBasketItem;
        
        $thirdBasketItem = new \Iyzipay\Model\BasketItem();
        $thirdBasketItem->setId("BI103");
        $thirdBasketItem->setName("Usb");
        $thirdBasketItem->setCategory1("Electronics");
        $thirdBasketItem->setCategory2("Usb / Cable");
        $thirdBasketItem->setItemType(\Iyzipay\Model\BasketItemType::PHYSICAL);
        $thirdBasketItem->setPrice("0.2");
        $basketItems[2] = $thirdBasketItem;
        $request->setBasketItems($basketItems);
        
        # make request
        $payWithIyzicoInitialize = \Iyzipay\Model\PayWithIyzicoInitialize::create($request, $this->options);`