import type { CustomerData, AddressData, ValidationResult } from '../../checkout/types';
/**
 * Validation utilities for checkout data
 */
/**
 * Validates customer data
 */
export declare function validateCustomerData(customer: CustomerData): ValidationResult;
/**
 * Validates address data
 */
export declare function validateAddressData(address: AddressData, isShipping?: boolean): ValidationResult;
/**
 * Validates checkout form data
 */
export declare function validateCheckoutForm(data: {
    customer: CustomerData;
    billingAddress: AddressData;
    shippingAddress?: AddressData;
    sameAsBilling: boolean;
}): ValidationResult;
/**
 * Validates order amount
 */
export declare function validateOrderAmount(amount: number, currency: string): ValidationResult;
/**
 * Sanitizes input data to prevent XSS and injection attacks
 */
export declare function sanitizeCustomerData(customer: CustomerData): CustomerData;
export declare function sanitizeAddressData(address: AddressData): AddressData;
/**
 * Validates that required environment variables are present
 */
export declare function validateEnvironmentVariables(): void;
/**
 * Rate limiting validation
 */
export declare function validateRateLimit(identifier: string, maxRequests?: number, windowMs?: number): boolean;