There are four options for how you use the totalling algorithm with this extension:

• Cumulative totalling – Each handling rate in the cart is added together to get a total handling rate, which is added to the shipping cost. For example: if product A has a handling rate of $4 per order and product B has a handling rate of $5 per order, the total handling fee would be $9.
• Highest price totalling – The handling rate is the highest handling rate found in the cart. So, for the above example, the total handling fee would be $5.
• Per unique product totalling – The handling rate is calculated per unique product in the cart. So if you have 100 of product A and 50 of product B, the extension would see the quantity in the cart as 2.
• Per item totalling – The handling rate is calculated based on each item’s individual price.