import type { YopConfig, YopRequestOptions, ContentType, YopResponse } from "./types.js";
/**
 * YopClient provides methods for interacting with the repay Open Platform (YOP) API.
 * It handles request signing, response verification, and configuration management.
 *
 * The client can be configured either through an explicit configuration object
 * passed to the constructor or via environment variables.
 */
export declare class YopClient {
    private readonly config;
    private readonly yopPublicKeyObject;
    private readonly timeout;
    /**
     * Creates an instance of YopClient.
     * ... (constructor docs remain the same) ...
     */
    constructor(config?: YopConfig);
    /**
     * Loads and validates the configuration, merging provided config, environment variables, and defaults.
     * Returns the configuration containing the public key as string or Buffer.
     * @param config Optional configuration object provided during instantiation.
     * @returns The validated and merged YopConfig with publicKey as string/Buffer.
     * @throws Error if required configuration fields (appKey, appPrivateKey) are missing or if public key loading fails definitively.
     */
    private _loadConfig;
    request<T extends YopResponse = YopResponse>(options: YopRequestOptions): Promise<T>;
    get<T extends YopResponse = YopResponse>(apiUrl: string, params: Record<string, unknown>, timeout?: number): Promise<T>;
    post<T extends YopResponse = YopResponse>(apiUrl: string, body: Record<string, unknown>, contentType?: ContentType, timeout?: number): Promise<T>;
    postJson<T extends YopResponse = YopResponse>(apiUrl: string, body: Record<string, unknown>, timeout?: number): Promise<T>;
}