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I have developed a commerce site in Drupal 7 which allows the user to both lend and borrow an item, I need to make a few changes to the way the commerce order form works so that once an order has been created both the lender and the owner of the item can haggle over rental dates before the borrower can complete payment for the order.
A new module will need to be created to enable the date range to be changed and the commerce order states to be updated dependant on who last change the dates and if the item owner has accepted the order.
In addition the order quantity will need to be determined by the amount of days selected from the date range so that the total cost will be accurately calculated.
You will not have to worry about the actual payment for the order as this already in hand.