All transactions are summarized on the invoice page, then they are able to click a button that sends them to PayPal, with their invoice number and grand total a

All transactions are summarized on the invoice page, then they are able to click a button that sends them to PayPal, with their invoice number and grand total as part of the information sent. There is no entering data twice. I assume you are speaking of when I talked of users entering their cost on PayPal. This was due to them not selecting anything to buy, but continuing to PayPal with a "Grand Total: $0" invoice anyway