Third Party App Update Cart

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My developers are saying that Shopify does not allow third party apps to update the customer’s cart.

As a result when customer edits his/her product specifications the cart won’t reflect the proper cost.

Has anyone found a workaround to this?

They are encouraging me to switch to Magento or Woocommerce, but I’m reluctant because I don’t know coding and per what I’ve found those two platforms require developer assistance to do anything.

I would greatly appreciate the community's help.