how to add new additional fee in cart?

[quang-ng]

Currently in cart, we have shipping fee and tax. In my case, I need to add one more fee additional named “services fee” based on the number of products in the cart. Could someone suggest an approach to implement it in MedusaJS?

[quangnst]

any update?? Quang, we are implementing it too

[quang-ng]

Sorry @quangnst, we're are discussing about it, not done yet. Will post here when we found a solution.

[srindom]

Hi @quang-ng - adding custom line items to a cart is possible. You can use this option to support something like a fee. An option would be to have a custom endpoint along the lines of POST /store/cart/:id/fees, which does something like this:

      const feeInclTax = await yourLogicToCalculateFee(cartId)
      await lineItemService.create({
        cart_id: cartId,
        title: "Fees",
        has_shipping: true,
        allow_discounts: false,
        unit_price: feeInclTax,
        quantity: 1,
        includes_tax: true
      })

The endpoint could then be called from the checkout flow at a suitable time to display the final total to the customer. You may also want to consider adding your own CartCompletionStrategy to add a validation step that ensures the fees have been added to the cart before the order gets processed.

Hope this helps :)

[quang-ng]

Thank you very much for your reply. Let me implement and update the result.

[recdpz]

Any update I'm implementing this as well would like to make sure I'm doing it right