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Combined Invoice System allows a seller combine any number of invoices (or items) into a single invoice for the same buyer. Combined invoice can have sold items spaced out in time.

For example, a buyer contacts seller to tell him that he wants to continue buying or bidding on more items from the seller, and he will pay when he has all of the items he needs to be shipped at once to save on shipping and handling fees. If seller agrees with buyer to issue a combined invoice when he finishes with buying items from the seller.

Finally, a combined invoice can combine not just items from various days or weeks but also can combine other previously unpaid invoices that the buyer did not pay yet.