import type { CartItem, CreateOrderRequest, ShippingMethod } from './types/shop.js';
export interface CheckoutFormFields {
    firstName: string;
    lastName: string;
    email: string;
    phone: string;
    addressLine1: string;
    addressLine2: string;
    city: string;
    country: string;
    /** Storefront locale at checkout (e.g. "zh-HK") — optional, used for order-notification language. */
    language?: string;
}
export declare function calculateFinalTotal(cartTotal: number, discountAmount: number, shippingCost: number, creditsApplied?: number): number;
export declare function validateCheckoutForm(fields: Pick<CheckoutFormFields, 'firstName' | 'lastName' | 'email' | 'addressLine1' | 'city'>): string | null;
export interface ShippingEligibility {
    method: ShippingMethod;
    meetsThreshold: boolean;
    locked: boolean;
    effectiveCost: number;
    amountToUnlock: number;
}
export declare function computeShippingEligibility(methods: ShippingMethod[], cartTotal: number): ShippingEligibility[];
export declare function pickDefaultShippingId(eligibility: ShippingEligibility[]): number | null;
export interface PaymentOptions {
    paymentMethodId?: string;
    creditsUsed?: string;
    successUrl?: string;
    cancelUrl?: string;
    acceptedOffers?: CreateOrderRequest['acceptedOffers'];
}
export declare function buildCreateOrderRequest(cart: CartItem[], form: CheckoutFormFields, shippingMethodId: number | null, promotionCode?: string, payment?: PaymentOptions): CreateOrderRequest;
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