import { FlexpriceCore } from "../core.js";
import { RequestOptions } from "../lib/sdks.js";
import { FlexPriceError } from "../sdk/models/flex-price-error.js";
import { ConnectionError, InvalidRequestError, RequestAbortedError, RequestTimeoutError, UnexpectedClientError } from "../sdk/models/http-client-errors.js";
import * as models from "../sdk/models/index.js";
import { ResponseValidationError } from "../sdk/models/response-validation-error.js";
import { SDKValidationError } from "../sdk/models/sdk-validation-error.js";
import { APIPromise } from "../types/async.js";
import { Result } from "../types/fp.js";
/**
 * Add addon to subscription
 *
 * @remarks
 * Deprecated: use POST /subscriptions/{id}/modify/execute with type "addon" and action "add", which also supports previewing the proration charge first.
 * Use when adding an optional product or add-on to an existing subscription (e.g. extra storage or support tier).
 *
 * @deprecated method: This will be removed in a future release, please migrate away from it as soon as possible.
 */
export declare function subscriptionsAddSubscriptionAddon(client: FlexpriceCore, request: models.AddAddonRequest, options?: RequestOptions): APIPromise<Result<models.AddAddonToSubscriptionResponse, models.ErrorsErrorResponse | FlexPriceError | ResponseValidationError | ConnectionError | RequestAbortedError | RequestTimeoutError | InvalidRequestError | UnexpectedClientError | SDKValidationError>>;
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