Once a seller issues a refund through PayPal - it can not be reversed. It is done. That is not saying it will show up right away - but for sure, the seller can not contact PayPal and reverse the refund.
So if you pay the new invoice, you will be out only the one payment. The refund will make it back to you sooner or later - most likely sooner. So you will be okay to pay the new invoice.
Did you pay with a debit or credit card? Those refunds bounce automatically back to the card and may not be visible there until the statement is run.
The invoice is his way of asking for the money again. Payment is NOT automatic.
This Is What A Invoice Is. When your invoice is available for viewing, we'll notify you by email. This email includes your amount due. If the amount due is greater than $1.00, the balance is automatically deducted from the automatic payment method you have on file.
All refunds go ONLY to your paypal account NOT to credit card
;;k