Few more questions

Shopify Partner
66 0 10

These are a couple of items we encounter while we are starting to use shopify POS...

1) How would we refund items that were process before the switch?  

2) We try to sell Gift Card, but system frooze (tried several times), it was unfufilled but order went through 25.  Then we try to refund it, but POS still thought that we should have money in the cash register, no sign of refund on POS even though the ORDERS section said there was a refund.

3) The reports for payment method contains column for refund and total payments, but it does not contain net total (payment-refund).  Our credit/debit machine spits out the NET totals, is it possible to add net total? on the POS it contains the NET total when closing register, but reports in admin page does not.