Postcode Shipping Help Center

The Postcode Shipping app proxy provides a secure way to make requests to the app from JavaScript within a Shopify theme. Because the proxy URL is part of the store's own domain, it avoids Cross-Origin Resource Sharing (CORS) blocks and eliminates the need for API keys, as Shopify handles the authentication automatically.

Default proxy URL: https://your-store.myshopify.com/apps/postcode-shipping

Global Modifiers allow you to apply temporary or long-term changes to all shipping rates without modifying each rate individually. They are ideal for promotional markups or reductions (e.g., 50% off shipping for orders over $30). Key capabilities include:

• Increasing or decreasing rate prices by a fixed amount or percentage.
• Modifying or replacing existing rate descriptions.
• Setting conditional rules to determine when the modifier is applied.

Depending on the target area (from individual postcodes to large regions), use the following rule types:

• Single Rules: Exact match for a whole postcode.
• Range Rules: Targets numerical postcodes within a specific numerical range.
• Wildcard Rules: Matches the first part of a postcode exactly.
• Wildcard-range Rules: Matches partial postcodes that fall within a given range.
• Area Rules: Matches against various parts of the destination address.

The Shipping Insurance Widget adds a toggle switch to the storefront (typically the cart page) that allows customers to add a shipping insurance charge to their order.

CRITICAL: This widget is a payment collection tool only. It does not provide actual insurance coverage. The merchant is responsible for:

• Arranging actual insurance with a carrier or provider.
• Handling all claims and lost shipment issues.
• Ensuring legal compliance regarding insurance charges in their jurisdiction.

Rate Rule Gap Analysis automatically monitors shipping rates within a region to detect logical gaps where cart conditions (weight, value, quantity, or product groups) are not covered by any rule. If a gap exists, customers matching those conditions will receive no shipping rates at checkout and cannot complete their order.

Analysis is triggered automatically when you:

• Create a new rate
• Edit an existing rate
• Duplicate a rate
• Delete a rate

Alerts appear on the region edit page above the rates list. Warning tones indicate critical gaps likely to cause checkout failures, while info tones indicate potential issues.