Many catalogs need different shipping by SKU or destination, not one store-wide rate. This app registers a carrier service with Shopify so checkout can request rates from your rules. You can set flat or per-product rules and control what happens when some cart lines have no matching rule, such as returning no rate, combining amounts into one rate, using a fallback, or trying the next rule.

• Per-variant shipping with line and per-item costs for flexible shipping.
• Destination matching - Apply rules by country, state, or postal code.
• Fallback and rule order - Control behavior when rules are missing or overlap.