/**
 * Custom fetch mutator for Orval-generated code.
 * Handles:
 * - Base URL configuration
 * - Authentication token injection
 * - Response parsing (JSON, Blob, Text)
 *
 * Entity ID is passed via headers in individual requests:
 * sdk.invoices.createInvoice(data, { headers: { 'x-entity-id': 'entity-123' } })
 */
export interface FetchConfig {
    baseUrl: string;
    getAccessToken: () => string | Promise<string>;
    clientName?: string;
    onUnauthorized?: (response: Response) => void;
}
export declare function setFetchConfig(config: FetchConfig): void;
/**
 * Set the global account ID for multi-account support.
 * When set, x-account-id header is automatically added to all SDK requests.
 */
export declare function setAccountId(id: string | null): void;
export declare function getAccountId(): string | null;
export declare function getFetchConfig(): FetchConfig;
/**
 * SDK Error class for API errors
 */
export declare class SDKError extends Error {
    status: number;
    statusText: string;
    body: unknown;
    constructor(status: number, statusText: string, body: unknown);
}
/**
 * Custom fetch implementation used by all generated API functions.
 * This is the mutator function that Orval will use for all API calls.
 *
 * Returns an object with { data, status, headers } to match the expected response type.
 */
export declare function customFetch<T>(url: string, options: RequestInit): Promise<T>;
export default customFetch;
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