interface RequestOptions {
    method: 'GET' | 'POST' | 'DELETE';
    token: string;
    timeout: number;
    body?: unknown;
    headers?: Record<string, string>;
}
/**
 * Shared HTTP request helper for USPS v3 API calls.
 * Handles auth headers, JSON serialization, error classification, and rate limits.
 */
export declare function uspsRequest<T>(url: string, options: RequestOptions): Promise<T>;
export {};
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