FluentCart shipping and tax

Treat shipping and tax as server-owned checkout calculations. A browser may select an available method and provide an address; it must not decide the method's eligibility, price, tax class, VAT result, or final total.

Read shipping-tax-pipeline.md before adding carrier quotes, destination rules, tax overrides, or reverse charge.

Resolve shipping from the current address

FluentCart stores zones, methods, and classes in its own tables. Use ShippingMethod::getApplicableForCountry() or the shipping module's services so selection zones are post-filtered by their country list and disabled/state- inapplicable methods disappear.