it requires a work around
when you send inventory to the third party processor, use inventory adjust, set the adjusting account to a clearing expense account (create one if you need to)
when you get the bill from the third party processor
1. in the item details part list the finished inventory item, qty, and the total amount of the third party bill PLUS the amount in the clearing expense account
2. move to the account details part of the bill, select the clearing expense account and enter that amount as a negative number (the balance in the clearing account)
the bill will now net to the original bill amount, pay the bill when ready.
