/**
 * Today x-callback-url parameters documented for action success and error callbacks.
 */
export type TodayXCallback = {
    /**
     * x-callback-url success callback URL.
     */
    xSuccess?: string;
    /**
     * x-callback-url error callback URL.
     */
    xError?: string;
};
export declare function xCallbackParams(payload: TodayXCallback): {
    'x-error'?: string | undefined;
    'x-success'?: string | undefined;
};
export declare function todayUrl(action: string, params?: Record<string, unknown>): string;