THEME: Launchpad Star Theme
In our checkout page, there's a manual selection of Shipping Method and we really need it to be auto-selected based on the products/amount they have in their carts.
Like this for example, seeing as they have an order over $100, then they can have the 'Free Shipping" BUT they also bought a product that is considered Heavy Goods, so in this case, the Heavy Goods Shipping should be auto-selected as the Shipping Method and NOT the 'Free Shipping'. And the customer should also not be able to manually choose the shipping method.
I don't know how to update the checkout page because I can't really edit a checkout liquid file with this because my client's not on a Shopify Plus plan. Is there a way to fix or update this?