Iyzipay\Model\Payment::retrieve PHP Method

    public static function retrieve(RetrievePaymentRequest $request, Options $options)
    {
        $rawResult = parent::httpClient()->post($options->getBaseUrl() . "/payment/detail", parent::getHttpHeaders($request, $options), $request->toJsonString());
        return PaymentMapper::create($rawResult)->jsonDecode()->mapPayment(new Payment());
    }

<?php

require_once 'config.php';
# create request class
$request = new \Iyzipay\Request\RetrievePaymentRequest();
$request->setLocale(\Iyzipay\Model\Locale::TR);
$request->setConversationId("123456789");
$request->setPaymentId("1");
$request->setPaymentConversationId("123456789");
# make request
$payment = \Iyzipay\Model\Payment::retrieve($request, Config::options());
# print result
print_r($payment);