import type { Options } from '../../types';
/**
 * Merged configuration for a single REST call.
 *
 * Combines the global SDK {@link Options} with per-request overrides
 * such as query parameters and retry count.
 */
interface RestClientConfig extends Options {
    /** Key-value pairs appended to the URL as query-string parameters. */
    queryParams?: Record<string, string | number>;
    /** Number of retry attempts for HTTP 5xx errors (default: {@link AppConfig.DEFAULT_RETRIES}). */
    retries?: number;
}
declare class RestClient {
    /** Generates a UUID v4 idempotency key for write operations. */
    private static generateIdempotencyKey;
    /**
     * Appends query-string parameters to a URL.
     *
     * Skips `undefined` values so callers don't need to pre-filter.
     * Handles URLs that already contain a `?` by appending with `&`.
     *
     * @param url - Base URL (may already include a query string).
     * @param queryParams - Key-value pairs to append.
     * @returns The URL with the encoded query string.
     */
    static appendQueryParamsToUrl(url: string, queryParams?: Record<string, string | number>): string;
    /**
     * Executes a function with exponential back-off on failure.
     *
     * Retries only when the error has an HTTP status >= 500 (server error).
     * Client errors (4xx) are thrown immediately.
     * The delay doubles on each attempt: `BASE_DELAY_MS * 2^attempt`.
     *
     * @typeParam T - Return type of the wrapped function.
     * @param fn - The async operation to execute and potentially retry.
     * @param retries - Maximum number of attempts before giving up.
     */
    private static retryWithExponentialBackoff;
    /**
     * Performs an HTTP request against the MercadoPago API.
     *
     * This is the single exit point for all network I/O in the SDK.
     * It merges SDK defaults with caller-provided overrides, injects
     * required headers, and normalises the JSON response.
     *
     * - **204 No Content** → returns `{ api_response }` with no body.
     * - **2xx with body** → returns the parsed JSON with `api_response` appended.
     * - **Non-2xx** → throws the parsed error body.
     *
     * @typeParam T - Expected shape of the parsed JSON response.
     * @param endpoint - API path relative to the base URL (e.g. `/v1/payments`).
     * @param config - Merged request settings (headers, body, method, options, etc.).
     * @returns Parsed API response with an `api_response` envelope.
     */
    static fetch<T>(endpoint: string, config?: RestClientConfig & RequestInit): Promise<T>;
}
export { RestClient };