import type { PaystackResponse } from "./types/global.js";
export declare enum HTTPMethod {
    GET = 0,
    POST = 1,
    PUT = 2,
    PATCH = 3,
    DELETE = 4
}
export default class RestClient {
    static BASE_URL: string;
    static ENV_SECRET_KEY_NAME: string;
    private secretKey;
    private client;
    constructor(secretKey?: string);
    call(endpoint: string, method: HTTPMethod, data?: any, params?: Record<string, any>): Promise<PaystackResponse<Record<string, any> | Record<string, any>[] | null | undefined>>;
    private get baseHeaders();
    private get headers();
    private getMethodHandler;
    private deserializeResponse;
    private requestPayloadTransformerInterceptor;
    private responsePayloadTransformerInterceptor;
    static camelToSnakeCaseTransformer(data: any): any;
    static snakeToCamelCaseTransformer(data: any): any;
    private handleRequestError;
    private handleResponseError;
    private loadPrivateKey;
}
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