write checks is nothing more than a data entry screen, you do not have to use an actual check or print it.
All bank type account, paypal included, use write checks, you can over write the check number with EFT (electronic funds transfer) or debit card (DC) or .... to show how the payment was made
QB does not take your scanned receipt and make accounting entries, attaching the scanned receipt is only for audit support of the transaction