Ability to pull in shipping costs via ShipStation for non-integrated shipping method orders

We extract data from Pressero twice a month in order to do billing for our storefront website. Having the actual shipping costs pulled in per order is crucial for proper reimbursement. Having to manually enter the shipping cost for each and every order is time-consuming, and allows for more "user error". With Onpoint we had that functionality, but we lost it when we had to switch to ShipStation.