Set up and test one rule.
- Open Apps → FP1 - Postcode Shipping Guard.
- Add a full code such as
SW1A 1AA, or a prefix ending in*such asSW1A*. - Use the country filter only when the rule should apply to one country.
- Save, then test one blocked code and one allowed code at checkout.
- Optional: under Cart notice, click Add cart notice to theme, then click Save in the Theme Editor. If the notice is already installed, the app shows Open cart theme editor instead.



