Combine Shopify shipping rates into one checkout line

Base €6.90. Extra length €4. Fire-retardant +€2.50. Checkout shows three methods, or one method that forgot the extras. Shoppers pick the cheap line; you eat the handling. Combine Shopify shipping rates into one checkout line is Combined rates: several zone rates → one checkout line, with an optional discount or markup. Checked 12 November 2026 on the OO - Shipping Rates & Rules listing (Free, 0 reviews, launched 28 October 2026; *Combine several rates into one checkout line, with discounts or markups*), docs Combined rates, Build rates in the visual flow, Rate pricing options, Add the carrier, Test checkout & activity logs, Rates missing at checkout, and Shopify Help Shipping rates. If Shopify moves the carrier-rate plan gate, or Combined rates leave the listing, re-read those sources before you email “one line, three components.”

The 8 November note is the visual rates flow — how you lay cards. This one is what checkout *displays* when two cards both match: separate methods, or one merged line.

Native zones do not add components

Shipping rates: flat, free, or carrier-calculated. One method, one price. A weight or cart-total scale is still one scale, not “base + fire-retardant” as two named pieces. Backup rates catch a carrier that fails — they do not merge.

Listing category Rate blending. Combined rates docs: *Merge multiple rates into one checkout line with optional discounts or markups.* That is blending inside this app, not three Shopify methods with two hidden.

Delivery customization (hide/rename/reorder) works on more plans, without Advanced. Hiding is not addition. Renaming a method “Standard + handling” does not change the money. Keep that canvas separate.

Carrier-calculated custom rates typically need Advanced Shopify or higher, a development / Partner development store, Plus, or a shop where the carrier is already active. Combined rates *are* rates. Without that gate the app shows a plan banner and a delivery-focused checklist. Do not claim merging works on Basic.

Three methods, one confused cart

Three rate cards, three service names. Checkout asks the shopper to choose. They pick €6.90. The extras exist — beside it.

One card with a coarse cart-total or weight table. Fine until a long slat weighs the same as a short one. Dimensional weight and product conditions exist so components can be priced apart — Combined rates so the shopper sees one line.

Hide on the surcharge methods. Delivery customization removes “Length extra.” Base stays €6.90. You hid a component; you did not add it.

Merge first, then discount or markup

Listing 12 Nov 2026: Free, 0 reviews. Visual flow or AI draft. 40+ conditions. Combined rates. Hide/rename/reorder. Activity logs 7 days. English UI.

In the app: Combined rates, next to the rates flow. You pick which zone rates may share one checkout line. Optional: discount or markup on that total. Checkout shows one service name, one price.

Sources: listing 12 Nov 2026; Combined rates collection; Rate pricing options; Delivery customization hub. If Combined rates gets its own plan gate, re-check “Free” before onboarding.

The sum is only as good as the cards that matched. Conditions (postcode, collection, metafield, date) decide who joins. Tags/collections/metafields load via Admin API at rate time. Market-driven shops: attach the carrier only on markets that own shipping. See add the carrier.

Activity logs, 7 days: which zone, which rates returned, why a path did not apply. If Combined merged nothing, the log usually says one card matched — or the carrier is missing on that zone. Open the log; do not guess.

Blinds, base + length, one line

NL zone. Base fixed €6.90. Slats longer than 180 cm: +€4 (product condition, metafield, or variant). Fire-retardant: +€2.50 (tag or collection — rules by collection).

What I would do on 12 November 2026:

1. Plan check: Advanced / development / Plus, or the carrier already active. Otherwise you stop at the banner.

2. Carrier on the Shopify zone or the market that owns shipping.

3. Visual flow: three cards, clear internal names. Test checkout without Combined — you should see three methods, or three returns in the logs. That proves the components live.

4. Combined rates: select those three, one service name “Standard,” no markup until the sum is right. Test: short blind €6.90. Long €10.90. Long + fire-retardant €13.40. One line.

5. Only then a threshold discount on the combined amount if you want “free over €75 of goods” — that is a rate discount, not a second method.

6. Weekend surcharge stays a time condition on a card, shop-local. Combined includes that card when it matches. See shipping rates by date.

AI may draft the flow. Review before save. Combined rates are not an AI feature; you tick the merge.

Get one line

1. Open OO - Shipping Rates & Rules. Listing 12 Nov 2026: Free, 0 reviews.

2. Confirm the carrier-rate plan gate.

3. Build the component cards. Test them separately.

4. Combined rates: merge, one name, test checkout, 7-day log.

5. Hide/rename only for methods you do not want in the sum — not as a substitute for merging.

Bottom line

Combine Shopify shipping rates into one checkout line is one method from several zone rates, with an optional discount or markup — not three methods with two hidden. Listing 12 Nov 2026 puts that merge in the hero. Carrier rates still need Advanced (or development/Plus). Logs tell you if a component missed. If the plan gate or Combined rates moves, re-check the table. CTA stays the listing.