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The preview page

The preview runs a made-up cart through your real setup, in the admin, without placing an order. It is the fastest way to answer "why is this customer not offered the courier?" — because it tells you which criterion failed, per rule.

How to use the preview​

  1. Open Preview in the app.
  2. Enter the destination: postal code and country.
  3. Add products through the Shopify product picker and set their quantities.
  4. (Optional) Add line item properties per product — for volume, length or a custom weight.
  5. (Optional) Enter customer tags as a comma-separated list, if your rules use them.
  6. Click Start preview.

Preview input

The cart is priced in your store currency; there is nothing to choose. Rules only look at the destination, never at where you ship from.

Reading the result​

Preview result

  • Green / red per rule — whether the rule is a candidate or was skipped.
  • Criterion by criterion — date, classes, zones, rate tiers and restriction groups, each with the value that was compared. A red zone row shows no match, a red class row shows which product has which class.
  • Yellow zone rows — the zone matched, but a more specific zone is the one paying the surcharge (see zone priority).
  • A rule that passed but lost on priority is shown collapsed — expand it with Show more.
  • Cost table — the methods that would be offered, with base cost and total per method.

What the preview does not tell you​

Plan limitsThe preview ignores them. It works fully on the Free plan, and it does not enforce the 3-rule limit of Basic. A cart that works here can still come up empty in a live checkout — see Plans & pricing.
Whether Shopify reaches the appThe preview calls the calculation directly. To test the connection itself, use the rate test in Troubleshooting.
Other shipping optionsOnly this app's rules are evaluated, not the flat rates you may have configured in Shopify.