/**
 * Validation Utilities
 */
/**
 * Validate merchant ID format
 * @param merchantId - Merchant ID to validate
 * @returns true if valid
 * @throws {Error} If merchant ID is invalid
 */
export declare function validateMerchantId(merchantId: string): boolean;
/**
 * Validate transaction ID format
 * @param tranId - Transaction ID to validate
 * @returns true if valid
 * @throws {Error} If transaction ID is invalid
 */
export declare function validateTransactionId(tranId: string): boolean;
/**
 * Validate amount
 * @param amount - Amount to validate
 * @returns true if valid
 * @throws {Error} If amount is invalid
 */
export declare function validateAmount(amount: number): boolean;
/**
 * Validate currency
 * @param currency - Currency to validate
 * @returns true if valid
 * @throws {Error} If currency is invalid
 */
export declare function validateCurrency(currency: string): boolean;
/**
 * Validate email format
 * @param email - Email to validate
 * @returns true if valid
 * @throws {Error} If email is invalid
 */
export declare function validateEmail(email: string): boolean;
/**
 * Validate required field
 * @param value - Value to validate
 * @param fieldName - Name of the field
 * @returns true if valid
 * @throws {Error} If field is missing
 */
export declare function validateRequired(value: any, fieldName: string): boolean;