// File generated from our OpenAPI spec by Stainless. See CONTRIBUTING.md for details.

import type { RequestInit, RequestInfo, BodyInit } from './internal/builtin-types';
import type { HTTPMethod, PromiseOrValue, MergedRequestInit, FinalizedRequestInit } from './internal/types';
import { uuid4 } from './internal/utils/uuid';
import { validatePositiveInteger, isAbsoluteURL, safeJSON } from './internal/utils/values';
import { sleep } from './internal/utils/sleep';
export type { Logger, LogLevel } from './internal/utils/log';
import { castToError, isAbortError } from './internal/errors';
import type { APIResponseProps } from './internal/parse';
import { getPlatformHeaders } from './internal/detect-platform';
import * as Shims from './internal/shims';
import * as Opts from './internal/request-options';
import { stringifyQuery } from './internal/utils/query';
import { VERSION } from './version';
import * as Errors from './core/error';
import * as Pagination from './core/pagination';
import { AbstractPage, type CursorPaginationParams, CursorPaginationResponse } from './core/pagination';
import * as Uploads from './core/uploads';
import * as API from './resources/index';
import { APIPromise } from './core/api-promise';
import {
  Billing,
  BillingCreateTopupInvoiceParams,
  BillingCreateTopupInvoiceResponse,
  BillingGetBalanceResponse,
  BillingListTransactionsParams,
  BillingListTransactionsResponse,
  BillingListTransactionsResponsesCursorPagination,
} from './resources/billing';
import { BrandRetrieveResponse, Brands } from './resources/brands';
import {
  Commission,
  CommissionListParams,
  CommissionStatus,
  CommissionType,
  Commissions,
  CommissionsCursorPagination,
  SettlementDirection,
} from './resources/commissions';
import { Event, EventListParams, Events, EventsCursorPagination } from './resources/events';
import {
  InstallationLink,
  MerchantConnectorCreateInstallationLinkParams,
  MerchantConnectors,
} from './resources/merchant-connectors';
import {
  Cancellation,
  Order,
  OrderCancelParams,
  OrderListParams,
  Orders,
  OrdersCursorPagination,
} from './resources/orders';
import { PaymentGateway, PaymentGatewaySession, PaymentGateways } from './resources/payment-gateways';
import {
  Product,
  ProductAvailability,
  ProductImage,
  ProductLookupParams,
  ProductVariant,
  Products,
  VariantDimension,
} from './resources/products';
import {
  Return,
  ReturnCreateParams,
  ReturnDenial,
  ReturnFailure,
  ReturnNextAction,
  ReturnReason,
  ReturnRefund,
  ReturnState,
  ReturnTimeline,
  Returns,
} from './resources/returns';
import {
  Shipment,
  ShipmentListParams,
  ShipmentStatus,
  ShipmentTracking,
  Shipments,
  ShipmentsCursorPagination,
} from './resources/shipments';
import { Betas, CheckoutSession } from './resources/betas/betas';
import {
  BaseCheckoutIntent,
  Buyer,
  CheckoutIntent,
  CheckoutIntentConfirmParams,
  CheckoutIntentCreateParams,
  CheckoutIntentListParams,
  CheckoutIntentPurchaseParams,
  CheckoutIntentsCursorPagination,
  CheckoutIntentsResource,
  Money,
  Offer,
  PaymentMethod,
  VariantSelection,
} from './resources/checkout-intents/checkout-intents';
import { TestHelpers } from './resources/test-helpers/test-helpers';
import { type Fetch } from './internal/builtin-types';
import { HeadersLike, NullableHeaders, buildHeaders } from './internal/headers';
import { FinalRequestOptions, RequestOptions } from './internal/request-options';
import { readEnv } from './internal/utils/env';
import {
  type LogLevel,
  type Logger,
  formatRequestDetails,
  loggerFor,
  parseLogLevel,
} from './internal/utils/log';
import { isEmptyObj } from './internal/utils/values';

const environments = {
  staging: 'https://staging.api.rye.com',
  production: 'https://api.rye.com',
};
type Environment = keyof typeof environments;

/**
 * Extracts the environment from a Rye API key.
 * API keys follow the format: RYE/{environment}-{key}
 * @param apiKey - The API key to parse
 * @returns The extracted environment ('staging' or 'production'), or null if the format doesn't match
 */
function extractEnvironmentFromApiKey(apiKey: string): Environment | null {
  const match = apiKey.match(/^RYE\/(staging|production)-/);
  return match ? (match[1] as Environment) : null;
}

export interface ClientOptions {
  /**
   * Rye API key. Format: `RYE/{environment}-abcdef`
   */
  apiKey?: string | undefined;

  /**
   * Specifies the environment to use for the API.
   *
   * Each environment maps to a different base URL:
   * - `staging` corresponds to `https://staging.api.rye.com`
   * - `production` corresponds to `https://api.rye.com`
   */
  environment?: Environment | undefined;

  /**
   * Override the default base URL for the API, e.g., "https://api.example.com/v2/"
   *
   * Defaults to process.env['CHECKOUT_INTENTS_BASE_URL'].
   */
  baseURL?: string | null | undefined;

  /**
   * The maximum amount of time (in milliseconds) that the client should wait for a response
   * from the server before timing out a single request.
   *
   * Note that request timeouts are retried by default, so in a worst-case scenario you may wait
   * much longer than this timeout before the promise succeeds or fails.
   *
   * @unit milliseconds
   */
  timeout?: number | undefined;
  /**
   * Additional `RequestInit` options to be passed to `fetch` calls.
   * Properties will be overridden by per-request `fetchOptions`.
   */
  fetchOptions?: MergedRequestInit | undefined;

  /**
   * Specify a custom `fetch` function implementation.
   *
   * If not provided, we expect that `fetch` is defined globally.
   */
  fetch?: Fetch | undefined;

  /**
   * The maximum number of times that the client will retry a request in case of a
   * temporary failure, like a network error or a 5XX error from the server.
   *
   * @default 2
   */
  maxRetries?: number | undefined;

  /**
   * Default headers to include with every request to the API.
   *
   * These can be removed in individual requests by explicitly setting the
   * header to `null` in request options.
   */
  defaultHeaders?: HeadersLike | undefined;

  /**
   * Default query parameters to include with every request to the API.
   *
   * These can be removed in individual requests by explicitly setting the
   * param to `undefined` in request options.
   */
  defaultQuery?: Record<string, string | undefined> | undefined;

  /**
   * Set the log level.
   *
   * Defaults to process.env['CHECKOUT_INTENTS_LOG'] or 'warn' if it isn't set.
   */
  logLevel?: LogLevel | undefined;

  /**
   * Set the logger.
   *
   * Defaults to globalThis.console.
   */
  logger?: Logger | undefined;
}

/**
 * API Client for interfacing with the Checkout Intents API.
 */
export class CheckoutIntents {
  apiKey: string;

  baseURL: string;
  maxRetries: number;
  timeout: number;
  logger: Logger;
  logLevel: LogLevel | undefined;
  fetchOptions: MergedRequestInit | undefined;

  private fetch: Fetch;
  #encoder: Opts.RequestEncoder;
  protected idempotencyHeader?: string;
  private _options: ClientOptions;

  /**
   * API Client for interfacing with the Checkout Intents API.
   *
   * @param {string | undefined} [opts.apiKey=process.env['CHECKOUT_INTENTS_API_KEY'] ?? undefined]
   * @param {Environment} [opts.environment=staging] - Specifies the environment URL to use for the API.
   * @param {string} [opts.baseURL=process.env['CHECKOUT_INTENTS_BASE_URL'] ?? https://staging.api.rye.com] - Override the default base URL for the API.
   * @param {number} [opts.timeout=1 minute] - The maximum amount of time (in milliseconds) the client will wait for a response before timing out.
   * @param {MergedRequestInit} [opts.fetchOptions] - Additional `RequestInit` options to be passed to `fetch` calls.
   * @param {Fetch} [opts.fetch] - Specify a custom `fetch` function implementation.
   * @param {number} [opts.maxRetries=2] - The maximum number of times the client will retry a request.
   * @param {HeadersLike} opts.defaultHeaders - Default headers to include with every request to the API.
   * @param {Record<string, string | undefined>} opts.defaultQuery - Default query parameters to include with every request to the API.
   */
  constructor({
    baseURL = readEnv('CHECKOUT_INTENTS_BASE_URL'),
    apiKey = readEnv('CHECKOUT_INTENTS_API_KEY'),
    ...opts
  }: ClientOptions = {}) {
    if (apiKey === undefined) {
      throw new Errors.CheckoutIntentsError(
        "The CHECKOUT_INTENTS_API_KEY environment variable is missing or empty; either provide it, or instantiate the CheckoutIntents client with an apiKey option, like new CheckoutIntents({ apiKey: 'My API Key' }).",
      );
    }

    // Auto-infer environment from API key
    const inferredEnvironment = extractEnvironmentFromApiKey(apiKey);

    // Validate environment option matches API key (if both provided)
    if (opts.environment && inferredEnvironment && opts.environment !== inferredEnvironment) {
      throw new Errors.CheckoutIntentsError(
        `Environment mismatch: API key is for '${inferredEnvironment}' environment but 'environment' option is set to '${opts.environment}'. Please use an API key that matches your desired environment or omit the 'environment' option to auto-detect from the API key (only auto-detectable with the RYE/{environment}-abcdef api key format).`,
      );
    }

    const options: ClientOptions = {
      apiKey,
      ...opts,
      baseURL,
      // Use provided environment, or infer from API key, or default to staging
      environment: opts.environment ?? inferredEnvironment ?? 'staging',
    };

    if (baseURL && opts.environment) {
      throw new Errors.CheckoutIntentsError(
        'Ambiguous URL; The `baseURL` option (or CHECKOUT_INTENTS_BASE_URL env var) and the `environment` option are given. If you want to use the environment you must pass baseURL: null',
      );
    }

    this.baseURL = options.baseURL || environments[options.environment || 'staging'];
    this.timeout = options.timeout ?? CheckoutIntents.DEFAULT_TIMEOUT /* 1 minute */;
    this.logger = options.logger ?? console;
    const defaultLogLevel = 'warn';
    // Set default logLevel early so that we can log a warning in parseLogLevel.
    this.logLevel = defaultLogLevel;
    this.logLevel =
      parseLogLevel(options.logLevel, 'ClientOptions.logLevel', this) ??
      parseLogLevel(readEnv('CHECKOUT_INTENTS_LOG'), "process.env['CHECKOUT_INTENTS_LOG']", this) ??
      defaultLogLevel;
    this.fetchOptions = options.fetchOptions;
    this.maxRetries = options.maxRetries ?? 2;
    this.fetch = options.fetch ?? Shims.getDefaultFetch();
    this.#encoder = Opts.FallbackEncoder;

    const customHeadersEnv = readEnv('CHECKOUT_INTENTS_CUSTOM_HEADERS');
    if (customHeadersEnv) {
      const parsed: Record<string, string> = {};
      for (const line of customHeadersEnv.split('\n')) {
        const colon = line.indexOf(':');
        if (colon >= 0) {
          parsed[line.substring(0, colon).trim()] = line.substring(colon + 1).trim();
        }
      }
      options.defaultHeaders = { ...parsed, ...options.defaultHeaders };
    }

    this._options = options;
    this.idempotencyHeader = 'Idempotency-Key';

    this.apiKey = apiKey;
  }

  /**
   * Create a new client instance re-using the same options given to the current client with optional overriding.
   */
  withOptions(options: Partial<ClientOptions>): this {
    const client = new (this.constructor as any as new (props: ClientOptions) => typeof this)({
      ...this._options,
      environment: options.environment ? options.environment : undefined,
      baseURL: options.environment ? undefined : this.baseURL,
      maxRetries: this.maxRetries,
      timeout: this.timeout,
      logger: this.logger,
      logLevel: this.logLevel,
      fetch: this.fetch,
      fetchOptions: this.fetchOptions,
      apiKey: this.apiKey,
      ...options,
    });
    return client;
  }

  /**
   * Check whether the base URL is set to its default.
   */
  #baseURLOverridden(): boolean {
    return this.baseURL !== environments[this._options.environment || 'staging'];
  }

  protected defaultQuery(): Record<string, string | undefined> | undefined {
    return this._options.defaultQuery;
  }

  protected validateHeaders({ values, nulls }: NullableHeaders) {
    return;
  }

  protected async authHeaders(opts: FinalRequestOptions): Promise<NullableHeaders | undefined> {
    return buildHeaders([{ Authorization: `Bearer ${this.apiKey}` }]);
  }

  protected stringifyQuery(query: object | Record<string, unknown>): string {
    return stringifyQuery(query);
  }

  private getUserAgent(): string {
    return `${this.constructor.name}/JS ${VERSION}`;
  }

  protected defaultIdempotencyKey(): string {
    return `stainless-node-retry-${uuid4()}`;
  }

  protected makeStatusError(
    status: number,
    error: Object,
    message: string | undefined,
    headers: Headers,
  ): Errors.APIError {
    return Errors.APIError.generate(status, error, message, headers);
  }

  buildURL(
    path: string,
    query: Record<string, unknown> | null | undefined,
    defaultBaseURL?: string | undefined,
  ): string {
    const baseURL = (!this.#baseURLOverridden() && defaultBaseURL) || this.baseURL;
    const url =
      isAbsoluteURL(path) ?
        new URL(path)
      : new URL(baseURL + (baseURL.endsWith('/') && path.startsWith('/') ? path.slice(1) : path));

    const defaultQuery = this.defaultQuery();
    const pathQuery = Object.fromEntries(url.searchParams);
    if (!isEmptyObj(defaultQuery) || !isEmptyObj(pathQuery)) {
      query = { ...pathQuery, ...defaultQuery, ...query };
    }

    if (typeof query === 'object' && query && !Array.isArray(query)) {
      url.search = this.stringifyQuery(query);
    }

    return url.toString();
  }

  /**
   * Used as a callback for mutating the given `FinalRequestOptions` object.
   */
  protected async prepareOptions(options: FinalRequestOptions): Promise<void> {}

  /**
   * Used as a callback for mutating the given `RequestInit` object.
   *
   * This is useful for cases where you want to add certain headers based off of
   * the request properties, e.g. `method` or `url`.
   */
  protected async prepareRequest(
    request: RequestInit,
    { url, options }: { url: string; options: FinalRequestOptions },
  ): Promise<void> {}

  get<Rsp>(path: string, opts?: PromiseOrValue<RequestOptions>): APIPromise<Rsp> {
    return this.methodRequest('get', path, opts);
  }

  post<Rsp>(path: string, opts?: PromiseOrValue<RequestOptions>): APIPromise<Rsp> {
    return this.methodRequest('post', path, opts);
  }

  patch<Rsp>(path: string, opts?: PromiseOrValue<RequestOptions>): APIPromise<Rsp> {
    return this.methodRequest('patch', path, opts);
  }

  put<Rsp>(path: string, opts?: PromiseOrValue<RequestOptions>): APIPromise<Rsp> {
    return this.methodRequest('put', path, opts);
  }

  delete<Rsp>(path: string, opts?: PromiseOrValue<RequestOptions>): APIPromise<Rsp> {
    return this.methodRequest('delete', path, opts);
  }

  private methodRequest<Rsp>(
    method: HTTPMethod,
    path: string,
    opts?: PromiseOrValue<RequestOptions>,
  ): APIPromise<Rsp> {
    return this.request(
      Promise.resolve(opts).then((opts) => {
        return { method, path, ...opts };
      }),
    );
  }

  request<Rsp>(
    options: PromiseOrValue<FinalRequestOptions>,
    remainingRetries: number | null = null,
  ): APIPromise<Rsp> {
    return new APIPromise(this, this.makeRequest(options, remainingRetries, undefined));
  }

  private async makeRequest(
    optionsInput: PromiseOrValue<FinalRequestOptions>,
    retriesRemaining: number | null,
    retryOfRequestLogID: string | undefined,
  ): Promise<APIResponseProps> {
    const options = await optionsInput;
    const maxRetries = options.maxRetries ?? this.maxRetries;
    if (retriesRemaining == null) {
      retriesRemaining = maxRetries;
    }

    await this.prepareOptions(options);

    const { req, url, timeout } = await this.buildRequest(options, {
      retryCount: maxRetries - retriesRemaining,
    });

    await this.prepareRequest(req, { url, options });

    /** Not an API request ID, just for correlating local log entries. */
    const requestLogID = 'log_' + ((Math.random() * (1 << 24)) | 0).toString(16).padStart(6, '0');
    const retryLogStr = retryOfRequestLogID === undefined ? '' : `, retryOf: ${retryOfRequestLogID}`;
    const startTime = Date.now();

    loggerFor(this).debug(
      `[${requestLogID}] sending request`,
      formatRequestDetails({
        retryOfRequestLogID,
        method: options.method,
        url,
        options,
        headers: req.headers,
      }),
    );

    if (options.signal?.aborted) {
      throw new Errors.APIUserAbortError();
    }

    const controller = new AbortController();
    const response = await this.fetchWithTimeout(url, req, timeout, controller).catch(castToError);
    const headersTime = Date.now();

    if (response instanceof globalThis.Error) {
      const retryMessage = `retrying, ${retriesRemaining} attempts remaining`;
      if (options.signal?.aborted) {
        throw new Errors.APIUserAbortError();
      }
      // detect native connection timeout errors
      // deno throws "TypeError: error sending request for url (https://example/): client error (Connect): tcp connect error: Operation timed out (os error 60): Operation timed out (os error 60)"
      // undici throws "TypeError: fetch failed" with cause "ConnectTimeoutError: Connect Timeout Error (attempted address: example:443, timeout: 1ms)"
      // others do not provide enough information to distinguish timeouts from other connection errors
      const isTimeout =
        isAbortError(response) ||
        /timed? ?out/i.test(String(response) + ('cause' in response ? String(response.cause) : ''));
      if (retriesRemaining) {
        loggerFor(this).info(
          `[${requestLogID}] connection ${isTimeout ? 'timed out' : 'failed'} - ${retryMessage}`,
        );
        loggerFor(this).debug(
          `[${requestLogID}] connection ${isTimeout ? 'timed out' : 'failed'} (${retryMessage})`,
          formatRequestDetails({
            retryOfRequestLogID,
            url,
            durationMs: headersTime - startTime,
            message: response.message,
          }),
        );
        return this.retryRequest(options, retriesRemaining, retryOfRequestLogID ?? requestLogID);
      }
      loggerFor(this).info(
        `[${requestLogID}] connection ${isTimeout ? 'timed out' : 'failed'} - error; no more retries left`,
      );
      loggerFor(this).debug(
        `[${requestLogID}] connection ${isTimeout ? 'timed out' : 'failed'} (error; no more retries left)`,
        formatRequestDetails({
          retryOfRequestLogID,
          url,
          durationMs: headersTime - startTime,
          message: response.message,
        }),
      );
      if (isTimeout) {
        throw new Errors.APIConnectionTimeoutError();
      }
      throw new Errors.APIConnectionError({ cause: response });
    }

    const responseInfo = `[${requestLogID}${retryLogStr}] ${req.method} ${url} ${
      response.ok ? 'succeeded' : 'failed'
    } with status ${response.status} in ${headersTime - startTime}ms`;

    if (!response.ok) {
      const shouldRetry = await this.shouldRetry(response);
      if (retriesRemaining && shouldRetry) {
        const retryMessage = `retrying, ${retriesRemaining} attempts remaining`;

        // We don't need the body of this response.
        await Shims.CancelReadableStream(response.body);
        loggerFor(this).info(`${responseInfo} - ${retryMessage}`);
        loggerFor(this).debug(
          `[${requestLogID}] response error (${retryMessage})`,
          formatRequestDetails({
            retryOfRequestLogID,
            url: response.url,
            status: response.status,
            headers: response.headers,
            durationMs: headersTime - startTime,
          }),
        );
        return this.retryRequest(
          options,
          retriesRemaining,
          retryOfRequestLogID ?? requestLogID,
          response.headers,
        );
      }

      const retryMessage = shouldRetry ? `error; no more retries left` : `error; not retryable`;

      loggerFor(this).info(`${responseInfo} - ${retryMessage}`);

      const errText = await response.text().catch((err: any) => castToError(err).message);
      const errJSON = safeJSON(errText) as any;
      const errMessage = errJSON ? undefined : errText;

      loggerFor(this).debug(
        `[${requestLogID}] response error (${retryMessage})`,
        formatRequestDetails({
          retryOfRequestLogID,
          url: response.url,
          status: response.status,
          headers: response.headers,
          message: errMessage,
          durationMs: Date.now() - startTime,
        }),
      );

      const err = this.makeStatusError(response.status, errJSON, errMessage, response.headers);
      throw err;
    }

    loggerFor(this).info(responseInfo);
    loggerFor(this).debug(
      `[${requestLogID}] response start`,
      formatRequestDetails({
        retryOfRequestLogID,
        url: response.url,
        status: response.status,
        headers: response.headers,
        durationMs: headersTime - startTime,
      }),
    );

    return { response, options, controller, requestLogID, retryOfRequestLogID, startTime };
  }

  getAPIList<Item, PageClass extends Pagination.AbstractPage<Item> = Pagination.AbstractPage<Item>>(
    path: string,
    Page: new (...args: any[]) => PageClass,
    opts?: PromiseOrValue<RequestOptions>,
  ): Pagination.PagePromise<PageClass, Item> {
    return this.requestAPIList(
      Page,
      opts && 'then' in opts ?
        opts.then((opts) => ({ method: 'get', path, ...opts }))
      : { method: 'get', path, ...opts },
    );
  }

  requestAPIList<
    Item = unknown,
    PageClass extends Pagination.AbstractPage<Item> = Pagination.AbstractPage<Item>,
  >(
    Page: new (...args: ConstructorParameters<typeof Pagination.AbstractPage>) => PageClass,
    options: PromiseOrValue<FinalRequestOptions>,
  ): Pagination.PagePromise<PageClass, Item> {
    const request = this.makeRequest(options, null, undefined);
    return new Pagination.PagePromise<PageClass, Item>(this as any as CheckoutIntents, request, Page);
  }

  async fetchWithTimeout(
    url: RequestInfo,
    init: RequestInit | undefined,
    ms: number,
    controller: AbortController,
  ): Promise<Response> {
    const { signal, method, ...options } = init || {};
    const abort = this._makeAbort(controller);
    if (signal) signal.addEventListener('abort', abort, { once: true });

    const timeout = setTimeout(abort, ms);

    const isReadableBody =
      ((globalThis as any).ReadableStream && options.body instanceof (globalThis as any).ReadableStream) ||
      (typeof options.body === 'object' && options.body !== null && Symbol.asyncIterator in options.body);

    const fetchOptions: RequestInit = {
      signal: controller.signal as any,
      ...(isReadableBody ? { duplex: 'half' } : {}),
      method: 'GET',
      ...options,
    };
    if (method) {
      // Custom methods like 'patch' need to be uppercased
      // See https://github.com/nodejs/undici/issues/2294
      fetchOptions.method = method.toUpperCase();
    }

    try {
      // use undefined this binding; fetch errors if bound to something else in browser/cloudflare
      return await this.fetch.call(undefined, url, fetchOptions);
    } finally {
      clearTimeout(timeout);
    }
  }

  private async shouldRetry(response: Response): Promise<boolean> {
    // Note this is not a standard header.
    const shouldRetryHeader = response.headers.get('x-should-retry');

    // If the server explicitly says whether or not to retry, obey.
    if (shouldRetryHeader === 'true') return true;
    if (shouldRetryHeader === 'false') return false;

    // Retry on request timeouts.
    if (response.status === 408) return true;

    // Retry on lock timeouts.
    if (response.status === 409) return true;

    // Retry on rate limits.
    if (response.status === 429) return true;

    // Retry internal errors.
    if (response.status >= 500) return true;

    return false;
  }

  private async retryRequest(
    options: FinalRequestOptions,
    retriesRemaining: number,
    requestLogID: string,
    responseHeaders?: Headers | undefined,
  ): Promise<APIResponseProps> {
    let timeoutMillis: number | undefined;

    // Note the `retry-after-ms` header may not be standard, but is a good idea and we'd like proactive support for it.
    const retryAfterMillisHeader = responseHeaders?.get('retry-after-ms');
    if (retryAfterMillisHeader) {
      const timeoutMs = parseFloat(retryAfterMillisHeader);
      if (!Number.isNaN(timeoutMs)) {
        timeoutMillis = timeoutMs;
      }
    }

    // About the Retry-After header: https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Retry-After
    const retryAfterHeader = responseHeaders?.get('retry-after');
    if (retryAfterHeader && !timeoutMillis) {
      const timeoutSeconds = parseFloat(retryAfterHeader);
      if (!Number.isNaN(timeoutSeconds)) {
        timeoutMillis = timeoutSeconds * 1000;
      } else {
        timeoutMillis = Date.parse(retryAfterHeader) - Date.now();
      }
    }

    // If the API asks us to wait a certain amount of time, just do what it
    // says, but otherwise calculate a default
    if (timeoutMillis === undefined) {
      const maxRetries = options.maxRetries ?? this.maxRetries;
      timeoutMillis = this.calculateDefaultRetryTimeoutMillis(retriesRemaining, maxRetries);
    }
    await sleep(timeoutMillis);

    return this.makeRequest(options, retriesRemaining - 1, requestLogID);
  }

  private calculateDefaultRetryTimeoutMillis(retriesRemaining: number, maxRetries: number): number {
    const initialRetryDelay = 0.5;
    const maxRetryDelay = 8.0;

    const numRetries = maxRetries - retriesRemaining;

    // Apply exponential backoff, but not more than the max.
    const sleepSeconds = Math.min(initialRetryDelay * Math.pow(2, numRetries), maxRetryDelay);

    // Apply some jitter, take up to at most 25 percent of the retry time.
    const jitter = 1 - Math.random() * 0.25;

    return sleepSeconds * jitter * 1000;
  }

  async buildRequest(
    inputOptions: FinalRequestOptions,
    { retryCount = 0 }: { retryCount?: number } = {},
  ): Promise<{ req: FinalizedRequestInit; url: string; timeout: number }> {
    const options = { ...inputOptions };
    const { method, path, query, defaultBaseURL } = options;

    const url = this.buildURL(path!, query as Record<string, unknown>, defaultBaseURL);
    if ('timeout' in options) validatePositiveInteger('timeout', options.timeout);
    options.timeout = options.timeout ?? this.timeout;
    const { bodyHeaders, body } = this.buildBody({ options });
    const reqHeaders = await this.buildHeaders({ options: inputOptions, method, bodyHeaders, retryCount });

    const req: FinalizedRequestInit = {
      method,
      headers: reqHeaders,
      ...(options.signal && { signal: options.signal }),
      ...((globalThis as any).ReadableStream &&
        body instanceof (globalThis as any).ReadableStream && { duplex: 'half' }),
      ...(body && { body }),
      ...((this.fetchOptions as any) ?? {}),
      ...((options.fetchOptions as any) ?? {}),
    };

    return { req, url, timeout: options.timeout };
  }

  private async buildHeaders({
    options,
    method,
    bodyHeaders,
    retryCount,
  }: {
    options: FinalRequestOptions;
    method: HTTPMethod;
    bodyHeaders: HeadersLike;
    retryCount: number;
  }): Promise<Headers> {
    let idempotencyHeaders: HeadersLike = {};
    if (this.idempotencyHeader && method !== 'get') {
      if (!options.idempotencyKey) options.idempotencyKey = this.defaultIdempotencyKey();
      idempotencyHeaders[this.idempotencyHeader] = options.idempotencyKey;
    }

    const headers = buildHeaders([
      idempotencyHeaders,
      {
        Accept: 'application/json',
        'User-Agent': this.getUserAgent(),
        'X-Stainless-Retry-Count': String(retryCount),
        ...(options.timeout ? { 'X-Stainless-Timeout': String(Math.trunc(options.timeout / 1000)) } : {}),
        ...getPlatformHeaders(),
      },
      await this.authHeaders(options),
      this._options.defaultHeaders,
      bodyHeaders,
      options.headers,
    ]);

    this.validateHeaders(headers);

    return headers.values;
  }

  private _makeAbort(controller: AbortController) {
    // note: we can't just inline this method inside `fetchWithTimeout()` because then the closure
    //       would capture all request options, and cause a memory leak.
    return () => controller.abort();
  }

  private buildBody({ options }: { options: FinalRequestOptions }): {
    bodyHeaders: HeadersLike;
    body: BodyInit | undefined;
  } {
    const { body, headers: rawHeaders } = options;
    if (!body) {
      // A resource method always passes a `body` key when its operation defines a
      // request body, even if the caller omitted an optional body param. Keep the
      // content-type for those, and only elide it for operations with no body at
      // all (e.g. GET/DELETE).
      if (body == null && 'body' in options) {
        return this.#encoder({ body, headers: buildHeaders([rawHeaders]) });
      }
      return { bodyHeaders: undefined, body: undefined };
    }
    const headers = buildHeaders([rawHeaders]);
    if (
      // Pass raw type verbatim
      ArrayBuffer.isView(body) ||
      body instanceof ArrayBuffer ||
      body instanceof DataView ||
      (typeof body === 'string' &&
        // Preserve legacy string encoding behavior for now
        headers.values.has('content-type')) ||
      // `Blob` is superset of `File`
      ((globalThis as any).Blob && body instanceof (globalThis as any).Blob) ||
      // `FormData` -> `multipart/form-data`
      body instanceof FormData ||
      // `URLSearchParams` -> `application/x-www-form-urlencoded`
      body instanceof URLSearchParams ||
      // Send chunked stream (each chunk has own `length`)
      ((globalThis as any).ReadableStream && body instanceof (globalThis as any).ReadableStream)
    ) {
      return { bodyHeaders: undefined, body: body as BodyInit };
    } else if (
      typeof body === 'object' &&
      (Symbol.asyncIterator in body ||
        (Symbol.iterator in body && 'next' in body && typeof body.next === 'function'))
    ) {
      return { bodyHeaders: undefined, body: Shims.ReadableStreamFrom(body as AsyncIterable<Uint8Array>) };
    } else if (
      typeof body === 'object' &&
      headers.values.get('content-type') === 'application/x-www-form-urlencoded'
    ) {
      return {
        bodyHeaders: { 'content-type': 'application/x-www-form-urlencoded' },
        body: this.stringifyQuery(body),
      };
    } else {
      return this.#encoder({ body, headers });
    }
  }

  static CheckoutIntents = this;
  static DEFAULT_TIMEOUT = 60000; // 1 minute

  static CheckoutIntentsError = Errors.CheckoutIntentsError;
  static APIError = Errors.APIError;
  static APIConnectionError = Errors.APIConnectionError;
  static APIConnectionTimeoutError = Errors.APIConnectionTimeoutError;
  static APIUserAbortError = Errors.APIUserAbortError;
  static NotFoundError = Errors.NotFoundError;
  static ConflictError = Errors.ConflictError;
  static RateLimitError = Errors.RateLimitError;
  static BadRequestError = Errors.BadRequestError;
  static AuthenticationError = Errors.AuthenticationError;
  static InternalServerError = Errors.InternalServerError;
  static PermissionDeniedError = Errors.PermissionDeniedError;
  static UnprocessableEntityError = Errors.UnprocessableEntityError;

  static toFile = Uploads.toFile;

  checkoutIntents: API.CheckoutIntentsResource = new API.CheckoutIntentsResource(this);
  betas: API.Betas = new API.Betas(this);
  brands: API.Brands = new API.Brands(this);
  orders: API.Orders = new API.Orders(this);
  products: API.Products = new API.Products(this);
  shipments: API.Shipments = new API.Shipments(this);
  commissions: API.Commissions = new API.Commissions(this);
  paymentGateways: API.PaymentGateways = new API.PaymentGateways(this);
  billing: API.Billing = new API.Billing(this);
  events: API.Events = new API.Events(this);
  merchantConnectors: API.MerchantConnectors = new API.MerchantConnectors(this);
  returns: API.Returns = new API.Returns(this);
  testHelpers: API.TestHelpers = new API.TestHelpers(this);
}

CheckoutIntents.CheckoutIntentsResource = CheckoutIntentsResource;
CheckoutIntents.Betas = Betas;
CheckoutIntents.Brands = Brands;
CheckoutIntents.Orders = Orders;
CheckoutIntents.Products = Products;
CheckoutIntents.Shipments = Shipments;
CheckoutIntents.Commissions = Commissions;
CheckoutIntents.PaymentGateways = PaymentGateways;
CheckoutIntents.Billing = Billing;
CheckoutIntents.Events = Events;
CheckoutIntents.MerchantConnectors = MerchantConnectors;
CheckoutIntents.Returns = Returns;
CheckoutIntents.TestHelpers = TestHelpers;

export declare namespace CheckoutIntents {
  export type RequestOptions = Opts.RequestOptions;

  export import CursorPagination = Pagination.CursorPagination;
  export {
    type CursorPaginationParams as CursorPaginationParams,
    type CursorPaginationResponse as CursorPaginationResponse,
  };

  export {
    CheckoutIntentsResource as CheckoutIntentsResource,
    type BaseCheckoutIntent as BaseCheckoutIntent,
    type Buyer as Buyer,
    type CheckoutIntent as CheckoutIntent,
    type Money as Money,
    type Offer as Offer,
    type PaymentMethod as PaymentMethod,
    type VariantSelection as VariantSelection,
    type CheckoutIntentsCursorPagination as CheckoutIntentsCursorPagination,
    type CheckoutIntentCreateParams as CheckoutIntentCreateParams,
    type CheckoutIntentListParams as CheckoutIntentListParams,
    type CheckoutIntentConfirmParams as CheckoutIntentConfirmParams,
    type CheckoutIntentPurchaseParams as CheckoutIntentPurchaseParams,
  };

  export { Betas as Betas, type CheckoutSession as CheckoutSession };

  export { Brands as Brands, type BrandRetrieveResponse as BrandRetrieveResponse };

  export {
    Orders as Orders,
    type Cancellation as Cancellation,
    type Order as Order,
    type OrdersCursorPagination as OrdersCursorPagination,
    type OrderListParams as OrderListParams,
    type OrderCancelParams as OrderCancelParams,
  };

  export {
    Products as Products,
    type Product as Product,
    type ProductAvailability as ProductAvailability,
    type ProductImage as ProductImage,
    type ProductVariant as ProductVariant,
    type VariantDimension as VariantDimension,
    type ProductLookupParams as ProductLookupParams,
  };

  export {
    Shipments as Shipments,
    type Shipment as Shipment,
    type ShipmentStatus as ShipmentStatus,
    type ShipmentTracking as ShipmentTracking,
    type ShipmentsCursorPagination as ShipmentsCursorPagination,
    type ShipmentListParams as ShipmentListParams,
  };

  export {
    Commissions as Commissions,
    type Commission as Commission,
    type CommissionStatus as CommissionStatus,
    type CommissionType as CommissionType,
    type SettlementDirection as SettlementDirection,
    type CommissionsCursorPagination as CommissionsCursorPagination,
    type CommissionListParams as CommissionListParams,
  };

  export {
    PaymentGateways as PaymentGateways,
    type PaymentGateway as PaymentGateway,
    type PaymentGatewaySession as PaymentGatewaySession,
  };

  export {
    Billing as Billing,
    type BillingCreateTopupInvoiceResponse as BillingCreateTopupInvoiceResponse,
    type BillingGetBalanceResponse as BillingGetBalanceResponse,
    type BillingListTransactionsResponse as BillingListTransactionsResponse,
    type BillingListTransactionsResponsesCursorPagination as BillingListTransactionsResponsesCursorPagination,
    type BillingCreateTopupInvoiceParams as BillingCreateTopupInvoiceParams,
    type BillingListTransactionsParams as BillingListTransactionsParams,
  };

  export {
    Events as Events,
    type Event as Event,
    type EventsCursorPagination as EventsCursorPagination,
    type EventListParams as EventListParams,
  };

  export {
    MerchantConnectors as MerchantConnectors,
    type InstallationLink as InstallationLink,
    type MerchantConnectorCreateInstallationLinkParams as MerchantConnectorCreateInstallationLinkParams,
  };

  export {
    Returns as Returns,
    type Return as Return,
    type ReturnDenial as ReturnDenial,
    type ReturnFailure as ReturnFailure,
    type ReturnNextAction as ReturnNextAction,
    type ReturnReason as ReturnReason,
    type ReturnRefund as ReturnRefund,
    type ReturnState as ReturnState,
    type ReturnTimeline as ReturnTimeline,
    type ReturnCreateParams as ReturnCreateParams,
  };

  export { TestHelpers as TestHelpers };
}