FP1 – Postcode Shipping Guard
Block restricted Postal/ZIP codes at checkout with simple rules — and optionally show a warning in the cart before checkout to set expectations early.
What it does
- Create simple rules that tell Shopify where you do and do not ship.
- When a customer enters their Postal/ZIP code at checkout, the app compares it to your rules.
- If a match is found, checkout is blocked for that destination with a clear message.
How to write rules
You can block a full code (exact match) or block a group of codes that start the same way.
For example, 941 blocks codes that start with 941, and SW1 blocks codes that
start with SW1.
For full codes, remove spaces (for example M4B1B3 instead of M4B 1B3).
Optional country targeting
Apply a rule to any country, or restrict it to a specific country using a standard two-letter country code (US, CA, GB, AU, etc).
Optional cart notice
If you add the theme block to your cart template, you can show a short notice on the cart page. The same wording can be used if a Postal/ZIP code is blocked at checkout.
FAQ
Does this change my theme?
No theme changes are required for checkout blocking. The optional cart notice only appears if you add the app block to your cart template.
What Postal/ZIP code formats are supported?
You can block a full code, or block a group by using a prefix with an asterisk at the end (like 941*, SW1*, M4B*, 2000*, and many others).
Do you store customer addresses?
No. The app evaluates the customer’s Postal/ZIP code only to apply your rules. Your rule settings are stored for your shop.
How do I get help writing rules?
Email [email protected] with your shop domain and a few examples of codes to block. We’ll help validate the rules.