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4SELLERS Shipping Rules

4SELLERS Shipping Rules is a powerful extension for your Shopify store that gives you full control over your shipping costs.

Instead of simple flat-rate or weight-based models, you define custom rules that combine zones, methods, rates, restrictions, and product classes into powerful, condition-based shipping logic.

Core Features​

  • Shipping Classes: Group products (e.g. "Standard", "Fragile") and assign specific surcharges.
  • Shipping Zones: Define precise delivery areas by country, postal code, or postal code ranges.
  • Shipping Methods: Create options such as "Express" or "Standard" that appear at checkout.
  • Shipping Rules: The heart of the app. Link zones, methods, and classes with price tiers and complex AND/OR restrictions.

How the Integration Works​

When installed, the app registers a carrier service (shipping provider) in your Shopify store. Shopify calls this service at checkout. All data (rules, zones, methods) is stored natively as Shopify metaobjects—not in an external database. The app only stores authentication sessions.