import { TransactionCallbackData, PreTransactionCallbackData, ReturnUrlCallbackData, DirectDebitBankApprovalCallbackData, DirectDebitAuthorizationCallbackData, DirectDebitTransactionCallbackData } from '../types';
export declare class CallbackVerifications {
    static verifyTransactionCallbackData(callbackData: TransactionCallbackData, secretKey: string): boolean;
    static verifyPreTransactionCallbackData(callbackData: PreTransactionCallbackData, secretKey: string): boolean;
    static verifyReturnUrlCallbackData(callbackData: ReturnUrlCallbackData, secretKey: string): boolean;
    static verifyDirectDebitBankApprovalCallbackData(callbackData: DirectDebitBankApprovalCallbackData, secretKey: string): boolean;
    static verifyDirectDebitAuthorizationCallbackData(callbackData: DirectDebitAuthorizationCallbackData, secretKey: string): boolean;
    static verifyDirectDebitTransactionCallbackData(callbackData: DirectDebitTransactionCallbackData, secretKey: string): boolean;
    private static generateChecksum;
}
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