Express checkout email receipt items not shown

My customers are receiving the email receipt from Paypal with no items shown. Only the total is shown (Email screenshot below).

Email receipt screenshot

But on cart before the payment, the items appear

Cart Screenshot

What i'm doing wrong?

The module npm module: paypal-express-checkout

Here's the params that im using to create the payment request.

params['L_PAYMENTREQUEST_0_AMT'+i]  = cart.items[key].preco.toFixed(2);
params['L_PAYMENTREQUEST_0_QTY'+i]  = cart.items[key].qtty;
params['L_PAYMENTREQUEST_0_NAME'+i] = cart.items[key].nome;

via Fábio Oliveira