import { CulqiOptions } from './culqi-client';
export interface RequestConfig {
    /** URL‑encoded query params */
    params?: Record<string, unknown>;
    /** JSON payload for POST / PATCH */
    data?: unknown;
    /** Extra HTTP headers */
    headers?: Record<string, string>;
    /** Use **public** key instead of secret */
    pub?: boolean;
    /** Override default timeout (ms) */
    timeout?: number;
    /** Override retry attempts */
    retries?: number;
}
export declare class CulqiError<T = unknown> extends Error {
    readonly status: number;
    readonly data: T | undefined;
    constructor(message: string, status: number, data: T | undefined);
}
export declare class HttpClient {
    private readonly opts;
    constructor(opts: CulqiOptions);
    get<T = unknown>(url: string, cfg?: RequestConfig): Promise<T>;
    post<T = unknown>(url: string, cfg: RequestConfig): Promise<T>;
    patch<T = unknown>(url: string, cfg: RequestConfig): Promise<T>;
    del<T = unknown>(url: string, cfg?: RequestConfig): Promise<T>;
    private headers;
    /** Serialize query parameters */
    private static serialize;
    private request;
}
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