There is a “known” PayPal partial refund bug in nopCommerce 3.50 version that has been reported by several nop users.

Issues (reported by users):

1) Anytime when a store admin issues a partial refund via PayPal, the nopCommerce dashboard automatically shows that the entire total amount has been refunded

2) The order notes does show the correct issued partial refund amount

3) The issue leads to incorrect profit / sales numbers because even the cancelled orders are there as a part of the sales / profit section in nopCommerce

Here is the bug in the code: 

public class PaymentPayPalStandardController  -> public ActionResult IPNHandler()
total = decimal.Parse(values["mc_gross"], new CultureInfo("en-US"));
 
 
case PaymentStatus.Refunded:
{
    if (_orderProcessingService.CanRefundOffline(order))
    {
        _orderProcessingService.RefundOffline(order);
    }
}

case PaymentStatus.Refunded:
{
    if (order.OrderTotal == Math.Abs(total))
    {
        if (_orderProcessingService.CanRefundOffline(order))
        {
            _orderProcessingService.RefundOffline(order);
        }
    }
    else
    {
        if (_orderProcessingService.CanPartiallyRefundOffline(order, Math.Abs(total)))
        {
            _orderProcessingService.PartiallyRefundOffline(order, Math.Abs(total));
        }
    }  
}

A complete fix (in respect of nopCommerce code) will be:

{
    var totalToRefund = Math.Abs(mc_gross);
    if (totalToRefund > 0 && Math.Round(totalToRefund, 2).Equals(Math.Round(order.OrderTotal, 2)))
      {
         //refund
        if (_orderProcessingService.CanRefundOffline(order))
       {
       _orderProcessingService.RefundOffline(order);
         }
           }
       else
    {
    //partial refund
    if (_orderProcessingService.CanPartiallyRefundOffline(order, totalToRefund))
          {
              _orderProcessingService.PartiallyRefundOffline(order, totalToRefund);
            }
}
}

For a complete solution, please see the changeset: https://nopcommerce.codeplex.com/SourceControl/changeset/1e3b16cf3fe2af5d43f676af2bedf39f64a4e9aa

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