import { Common, LNMResult, LNMExpress } from './mpesa.common';
export declare class Mpesa extends Common {
    private customerKey;
    private customerSecret;
    private daraja;
    initialize(customerKey: string, customerSecret: string, env: 'SANDBOX' | 'PRODUCTION'): Promise<string>;
    requestMPESAExpress(lnmExpress: LNMExpress): Promise<LNMResult>;
    private getTransactionType;
    private getENV;
}