import type { APIResponse } from '../../checkout/types';
/**
 * Creates a standardized API response
 */
export declare function createApiResponse<T>(success: boolean, data?: T, error?: {
    message: string;
    code?: string;
    details?: Record<string, any>;
}): APIResponse<T>;
/**
 * Creates a success response
 */
export declare function createSuccessResponse<T>(data: T): APIResponse<T>;
/**
 * Creates an error response
 */
export declare function createErrorResponse(message: string, code?: string, details?: Record<string, any>): APIResponse;
/**
 * Validates required environment variables
 */
export declare function validateEnvironment(): void;
/**
 * Validates request method
 */
export declare function validateMethod(req: any, allowedMethods: string[]): boolean;
/**
 * Extracts and validates request body
 */
export declare function validateRequestBody<T>(req: any, requiredFields: (keyof T)[]): T;
/**
 * Safely parses JSON with error handling
 */
export declare function safeJsonParse<T>(json: string): T | null;
/**
 * Formats currency amount for display
 */
export declare function formatCurrency(amount: number, currency: string): string;
/**
 * Converts currency amount to cents
 */
export declare function toCents(amount: number): number;
/**
 * Converts cents to currency amount
 */
export declare function fromCents(cents: number): number;
/**
 * Generates a unique order reference
 */
export declare function generateOrderReference(): string;
/**
 * Validates email format
 */
export declare function isValidEmail(email: string): boolean;
/**
 * Validates phone number format (basic validation)
 */
export declare function isValidPhone(phone: string): boolean;
/**
 * Sanitizes string input to prevent XSS
 */
export declare function sanitizeString(input: string): string;
/**
 * Rate limiting helper
 */
export declare class RateLimiter {
    private attempts;
    isAllowed(key: string, maxAttempts?: number, windowMs?: number): boolean;
}