Item description and sums missing in paypal express checkout approval page - node.js

Question

I am using paypal REST API to test out express checkout on sandbox environment.
Everything works fine except one thing: order description area is rather empty: no summs, no individual item information, no total order sum amount - I can see only my dummy description" regardless that I do pass order summ amount.
I am passing payment information similar to one used in the example apps:
var ppPayment = {
"intent": "sale",
"payer": {
"payment_method": "paypal"
},
"redirect_urls": {},
"transactions": [{
"amount": {
"currency": "EUR",
"details": {
"subtotal": 0
}
}
}]
};
ppPayment.transactions[0].amount.total = params.req_order_amount;
ppPayment.redirect_urls.return_url = "http://xxxxxxxxx/confirm?order_id=" + order_id;
ppPayment.redirect_urls.cancel_url = "http://xxxxxxxxx/cancel?order_id" + order_id;
ppPayment.transactions[0].description = "Dummy description";
ppPayment.transactions[0].amount.details.subtotal = params.req_order_amount;
What lines should I add to the payment.create call to user to be able to see the description like displayed here ?

Answer 1

Follow the API
PayPal REST API Reference
You need to create transaction object inside which item_list object consisting of items. Lets name one item object or and go by your screenshot :
paypalItem.name
..until 6. : See API for item object. Some fields only exist in invoice_item object
..until 10. : See API for Invoice object
Good luck

Answer 2

So the explicit answer will be :
ppPayment.transactions[0].amount.total = params.req_order_amount;
ppPayment.redirect_urls.return_url = "http://xxxxxxxxx/confirm?order_id=" + order_id;
ppPayment.redirect_urls.cancel_url = "http://xxxxxxxxx/cancel?order_id" + order_id;
ppPayment.transactions[0].description = "Dummy description";
ppPayment.transactions[0].amount.details.subtotal = params.req_order_amount;
ppPayment.transactions[0].item_list =
{
items: [{quantity: 1, name: 'My stuff', price: params.req_order_amount, currency: "USD"}]
};