/**
 * @pwngh/economy-lab
 *
 * Copyright (c) Preston Neal
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE.md file in the root directory of this source tree.
 *
 * @license MIT
 */
import type { Ctx, Operation, Outcome } from '../contract.js';
import type { Unit } from '../ports.js';
/**
 * Charge the first month of a subscription and create its record: validate the price, post the
 * charge (seller earns, platform takes its fee), then save the `Subscription` the background
 * worker renews each later month. Returns `committed`, or a `rejected` outcome for a duplicate
 * active subscription (`ALREADY_SUBSCRIBED`) or a short spendable balance (`INSUFFICIENT_FUNDS`).
 *
 * @see {@link https://economy-lab-docs.pages.dev/economy/reference/operations/subscribe/ Subscribe}
 *   for the first-month charge and renewal handoff.
 */
export declare function subscribe(operation: Operation, unit: Unit, ctx: Ctx): Promise<Outcome>;