import { StkPushPayloadType, StkPushResponse } from './models/StkPushResponse';
import { B2CPayloadType, B2CResponse } from './models/B2CPaymentResponse';
import { RegisterUrlPayloadType, RegisterUrlResponse } from './models/C2BUrlResponse';
import { LogLevel } from './Logger';
export interface MpesaConfig {
    environment: 'sandbox' | 'production';
    apiKey: string;
    secretKey: string;
    timeout?: number;
    retries?: number;
    logLevel?: LogLevel;
}
export declare class MPesa {
    private static instance;
    private config;
    private apiClient;
    private logger;
    accessToken: string | null;
    tokenExpiry: number | null;
    private constructor();
    static getInstance(config: MpesaConfig): MPesa;
    authenticate(): Promise<void>;
    private makeAuthorizedRequest;
    /**
     * Sends an STK Push request to the M-Pesa API.
     * @param payload - The payload for the STK Push request.
     * @returns A StkPushResponse instance representing the response.
     * @throws StkPushError if the API returns an error response.
     */
    stkPush(payload: StkPushPayloadType): Promise<StkPushResponse>;
    /**
     * Registers validation and confirmation URLs with the M-Pesa API.
     * @param payload - The payload for the Register URL request.
     * @returns A RegisterUrlResponse instance representing the response.
     * @throws RegisterUrlError if the API returns an error response.
     */
    registerC2BUrl(payload: RegisterUrlPayloadType): Promise<RegisterUrlResponse>;
    /**
     * Sends a B2C Pay Out request to the M-Pesa API.
     * @param payload - The payload for the B2C Pay Out request.
     * @returns A B2CResponse instance representing the response.
     * @throws B2CError if the API returns an error response.
     */
    b2cPayment(payload: B2CPayloadType): Promise<B2CResponse>;
}