/**
 * Validation utilities
 */
import { PaymentSessionConfig } from '../types';
/**
 * Validate email format
 */
export declare function isValidEmail(email: string): boolean;
/**
 * Validate amount (positive number)
 */
export declare function isValidAmount(amount: number): boolean;
/**
 * Validate currency code (ISO 4217)
 */
export declare function isValidCurrency(currency: string): boolean;
/**
 * Validate phone number (basic validation)
 */
export declare function isValidPhoneNumber(phone: string): boolean;
/**
 * Validate postal code (flexible format)
 */
export declare function isValidPostalCode(postalCode: string, country?: string): boolean;
/**
 * Validate order ID format
 */
export declare function isValidOrderId(orderId: string): boolean;
/**
 * Validate URL format
 */
export declare function isValidUrl(url: string): boolean;
/**
 * Validate split payment configuration
 */
export declare function validateSplitPayments(splits: Array<{
    amount: number;
}>, totalAmount: number): {
    valid: boolean;
    error?: string;
};
/**
 * Validate payment configuration
 */
export declare function validatePaymentConfig(config: PaymentSessionConfig): {
    valid: boolean;
    errors: string[];
};