Real-Time LTL Freight Rates at Shopify Checkout: A Custom Middleware Approach
Less-than-truckload (LTL) freight pricing is not flat-rate shipping. It depends on weight, dimensions, distance, and — critically — delivery conditions that standard Shopify shipping apps don't model at all: liftgate requirements and whether the destination is residential or commercial.
Why off-the-shelf apps didn't work
Every Shopify freight app we evaluated either used flat-rate approximations or didn't support liftgate/residential detection as an input to the rate itself. For heavy freight, that gap is the difference between a quoted price and the price a carrier actually bills — which either eats margin or gets disputed by the customer after checkout.
What we built instead
Custom Laravel middleware sits between Shopify checkout and the freight carrier's rate API. At checkout, it evaluates the cart's shipping-relevant attributes, determines liftgate necessity from product data, detects residential versus commercial delivery from the shipping address, and requests a real-time rate from the freight API with all of that factored in — not a static rate table.
The lesson for merchants selling freight-class goods
If your product needs LTL shipping, don't assume a marketplace app covers your pricing accuracy. Ask specifically whether it supports liftgate and residential/commercial detection as rate inputs — most don't, and the gap only shows up after you've absorbed a few underpriced shipments.
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