PHP JSON Finance

<?php
function microtime_float()
{
    list($usec, $sec) = explode(" ", microtime());
    return ((float)$usec + (float)$sec);
}
$time_start = microtime_float();
 
$request = array(
	'Credentials' => array(
		'ApiKey' => "API_KEY"
	),
    'Customer' => array(
        'Reference' => "SESSIONID"
    ),
	'Parameters' => array(
        'Term' => "36",
        'Deposit' => "10",
        'DepositType' => "Percentage",
        'AnnualMileage' => "10000"
	),
    'VehicleRequests' => array(
        array(
            'Id' => '1234',
            'Vehicle' => array(
                'CashPrice' => "10000",
                'IsNew' => "true",
                'Identifier' => "CAP_ID",
                'IdentifierType' => "CapShortCode",
                'Type' => "Car",
                'StockId' => "12345",
                'ImageUrl' => "http://notworking.com/1234.jpg",
                'DealerVehicleUrl' => "http://notworking.com/1234/",
                'IsVatQualifying' => "true"
            )
        )
    )
);
 
$data = json_encode($request);
echo($data);
print "\r\n---------------------------------------------------------------------------------\r\n";
 
$options = array(
    'http' => array(
        'header'  => array(
            "Referer: http://localhost",
            "Content-type: application/json",
            "Accept: application/json",
                sprintf('Content-Length: %d', strlen($data))
        ),
        'method'  => 'POST',
        'content' => $data,
    )
);
$url = 'https://demoservices.codeweavers.net/public/v2/JsonFinance/Calculate';
$context  = stream_context_create($options);
$response = file_get_contents($url, false, $context);
print_r($response);
print "\r\n---------------------------------------------------------------------------------\r\n";
$time_end = microtime_float();
$time = $time_end - $time_start;
echo "The request took $time seconds\n\n\n";