Laravel Paypal error when adding PayPal::details() in transaction - laravel-5

Question

First time doing paypal integration in laravel. I'm trying to add details such as subtotal of items and totaltax, I have this controller.
$payer = PayPal::Payer();
$payer->setPaymentMethod('paypal');
$item1 = PayPal::item();
item1->setName('Item1 name')
->setDescription('item1 description')
->setCurrency('USD')
->setQuantity(1)
->setPrice(35);
$item2 = PayPal::item();
$item2->setName('Item2 name')
->setDescription('item2 description')
->setCurrency('USD')
->setQuantity(1)
->setPrice(300);
$itemList = PayPal::itemList();
$itemList->setItems(array($item1,$item2));
$details = PayPal::Details();
$details->setShipping(1);
$details->setTax(10);
$details->setSubtotal(17.5);
$amount = PayPal::Amount();
$amount->setCurrency('USD');
$amount->setTotal(335)
->setDetails($details);
$transaction = PayPal::Transaction();
$transaction->setAmount($amount);
$transaction->setItemList($itemList);
$transaction->setDescription('What are you selling?');
$redirectUrls = PayPal:: RedirectUrls();
$redirectUrls->setReturnUrl(action('paypal_Controller\paypalctr#getDone'));
$redirectUrls->setCancelUrl(action('paypal_Controller\paypalctr#getCancel'));
$payment = PayPal::Payment();
$payment->setIntent('sale');
$payment->setPayer($payer);
$payment->setRedirectUrls($redirectUrls);
$payment->setTransactions(array($transaction));
$response = $payment->create($this->_apiContext);
$redirectUrl = $response->links[1]->href;
return Redirect::to( $redirectUrl );
I got this error:
PayPalConnectionException in PayPalHttpConnection.php line 177:
Got Http response code 400 when accessing https://api.sandbox.paypal.com/v1/payments/payment.
But when I remove ->setDetails($details), it works but no subtotal.

Answer 1

I figured out that Paypal only accepts correct computation.
If you want to add totaltax u need to add ->setTax() per item.
$item1 = PayPal::item();
$item1->setName('Item1 Name')
->setDescription('Item1 Description')
->setCurrency('USD')
->setQuantity('2')
->setTax(2.0)
->setPrice('350');
$item2 = PayPal::item();
$item2->setName('Item2 Name')
->setDescription('Item2 Description')
->setCurrency('USD')
->setQuantity('1')
->setTax(0)
->setPrice('300');
Then computation must be correct.item1 tax =(2.0 * 2) + item2 tax = 0 totaltax = 4.0 item1 price = (350 * 2) + item2 price = 300 subtotal = 1000.
$details = PayPal::details();
$details->setShipping('0');
$details->setTax(4.0);
$details->setSubtotal('1000');
shipping + totaltax + subtotal = 1004.0
$amount = PayPal::Amount();
$amount->setCurrency('USD');
$amount->setTotal(1004.0);
$amount->setDetails($details);
Hope it will help someone. :)