3. Set your Paddle API key as an environment variable:

PADDLE_API_KEY=your_live_or_sandbox_key
PADDLE_ENV=sandbox   # or production

4. Import from the local source or from the installed package. If using the source directly, point imports at src/paddle-sdk/paddle.ts and src/paddle-sdk/entities/index.ts. If you prefer the compiled package, import from @paddle/paddle-node-sdk as shown in the examples below; both resolve to identical code.

5. Instantiate the client once and export it as a singleton:

// src/lib/paddle.ts
import { Paddle, Environment, LogLevel } from '@paddle/paddle-node-sdk';

export const paddle = new Paddle(process.env.PADDLE_API_KEY!, {
  environment:
    process.env.PADDLE_ENV === 'production'
      ? Environment.production
      : Environment.sandbox,
  logLevel: LogLevel.error,
});

Public API

Paddle

class Paddle {
  constructor(apiKey: string, options?: {
    environment?: Environment;
    logLevel?: LogLevel;
    customHeaders?: Record<string, string>;
  });

  products: ProductsResource;
  prices: PricesResource;
  customers: CustomersResource;
  subscriptions: SubscriptionsResource;
  transactions: TransactionsResource;
  adjustments: AdjustmentsResource;
  discounts: DiscountsResource;
  addresses: AddressesResource;
  businesses: BusinessesResource;
  notifications: NotificationsResource;
  // ...all other resources
}

The central client class. Instantiate once per process with your API key. Every Paddle resource is accessible as a property. Switch environment between Environment.sandbox and Environment.production to target different API endpoints.

CustomData

export type CustomData = Record<string, any>;

A generic key-value map accepted on transactions, subscriptions, customers, and other entities as the customData field. Use it to attach your own business metadata (order IDs, user IDs, plan codes) to Paddle objects without requiring schema changes on Paddle's side.

Environment (enum)

enum Environment {
  production = 'production',
  sandbox    = 'sandbox',
}

Passed to the Paddle constructor to control which Paddle API base URL is called. Always default to sandbox during development; switch to production only with live API keys. Sandbox and production API keys are not interchangeable.

Working examples

Scenario - List all active subscriptions for a customer

Retrieve every subscription associated with a customer using the async iterator returned by list. Iterate with for await to transparently handle pagination.

import { paddle } from './lib/paddle';

async function getCustomerSubscriptions(customerId: string) {
  const subscriptions = paddle.subscriptions.list({ customerId });

  for await (const subscription of subscriptions) {
    console.log(subscription.id, subscription.status, subscription.currentBillingPeriod);
  }
}

getCustomerSubscriptions('ctm_01abc123').catch(console.error);

Scenario - Create a transaction and attach custom metadata

Build a one-time transaction for a customer with custom metadata so your system can correlate it with an internal order.

import { paddle } from './lib/paddle';
import type { CustomData } from '@paddle/paddle-node-sdk';

async function createOrder(customerId: string, priceId: string, internalOrderId: string) {
  const customData: CustomData = { orderId: internalOrderId, source: 'api' };

  const transaction = await paddle.transactions.create({
    items: [{ priceId, quantity: 1 }],
    customerId,
    customData,
  });

  console.log('Transaction created:', transaction.id, transaction.status);
  return transaction;
}

Scenario - Verify and parse an inbound webhook notification

Use the notifications resource to verify Paddle's HMAC signature and deserialize the payload into a typed event entity before processing.

import express from 'express';
import { paddle } from './lib/paddle';

const app = express();

app.post(
  '/webhooks/paddle',
  express.raw({ type: 'application/json' }),
  async (req, res) => {
    const signature = req.headers['paddle-signature'] as string;
    const rawBody = req.body.toString();

    try {
      const event = await paddle.notifications.unmarshal(
        rawBody,
        process.env.PADDLE_WEBHOOK_SECRET!,
        signature,
      );

      switch (event.eventType) {
        case 'subscription.activated':
          console.log('Subscription activated:', event.data.id);
          break;
        case 'transaction.completed':
          console.log('Transaction completed:', event.data.id);
          break;
      }

      res.sendStatus(200);
    } catch (err) {
      console.error('Invalid webhook signature', err);
      res.sendStatus(400);
    }
  },
);

File walkthrough

• paddle.ts - Instantiates all resource classes and wires them onto the Paddle client; the single entry point your application code should depend on.
• entities/ - Plain TypeScript classes that represent hydrated API response objects. Each sub-directory maps to one Paddle resource domain and exports a primary entity class plus a collection wrapper.
• entities/index.ts - Barrel re-export of every entity, collection, and the CustomData type alias; import from here to avoid deep path coupling.
• enums/ - Shared string enum constants (status values, action types, currency codes, etc.) used in both request and response types.
• internal/ - Private HTTP layer: fetch wrapper, pagination cursor logic, error class hierarchy, and response deserializer. Not intended for direct use.
• notifications/ - Webhook signature verification and event payload unmarshaling. Used server-side when receiving Paddle event callbacks.
• resources/ - One class per Paddle API resource with list, get, create, update, and resource-specific action methods.
• types/ - Request parameter interfaces and response shape types consumed by resource methods and entity constructors.
• index.cjs.node.ts / index.esm.node.ts - Node.js-targeted entry points (CJS and ESM). Use these when bundling for a standard Node.js server.
• index.cjs.edge.ts / index.esm.edge.ts - Edge-runtime entry points (Cloudflare Workers, Vercel Edge). Same surface area, different internal fetch adapter.

Common pitfalls and fixes

• Wrong API key for environment: Sandbox keys start with a different prefix; using a live key with Environment.sandbox returns 401. Always generate a dedicated sandbox key in the Paddle dashboard.
• fetch not defined on Node.js 16: The SDK uses native fetch; on Node 16 add import 'cross-fetch/polyfill' before constructing Paddle.
• Forgetting to iterate the list: paddle.subscriptions.list(...) returns an async iterator, not a Promise. Calling await on it does nothing useful; always use for await or call .next().
• snake_case vs camelCase mismatch: The Paddle API docs show snake_case field names; this SDK uses camelCase in both requests and responses. custom_data in docs → customData in SDK.
• ESM .js extension in source imports: The source files use .js extensions on relative imports for ESM compatibility. If you compile with tsc targeting CommonJS without moduleResolution: node16, these extensions may cause resolution failures. Set moduleResolution to node16 or bundler.
• Webhook raw body parsing: Express must receive the raw Buffer for signature verification. Do not apply express.json() globally before the webhook route; use express.raw({ type: 'application/json' }) only on the webhook endpoint.

Vibe-coding prompt template

I have dropped the Paddle Node.js SDK source into `src/paddle-sdk/` in my project.
The USAGE.md for this block is at `USAGE.md`. The upstream package is `@paddle/paddle-node-sdk@3.8.0`.

Please help me integrate it step by step:

1. Read `USAGE.md` and `src/paddle-sdk/paddle.ts` to understand the client API.
2. Create `src/lib/paddle.ts` that instantiates `Paddle` using environment variables
   `PADDLE_API_KEY` and `PADDLE_ENV`.
3. Add a webhook handler in my Express app that uses `paddle.notifications.unmarshal`
   to verify signatures and route events.
4. Add a service function that lists subscriptions for a given customerId using
   `for await` over the async iterator.
5. Ensure all imports use the real exported symbols from `src/paddle-sdk/entities/index.ts`
   and `src/paddle-sdk/paddle.ts`. Do not invent any method or type names.
6. Show me the required `tsconfig.json` changes and any env vars I need to add to `.env`.

License and credit

The Paddle Node.js SDK is released under the MIT License. See the upstream repository at https://github.com/PaddleHQ/paddle-node-sdk and the published package at https://www.npmjs.com/package/@paddle/paddle-node-sdk for full license text and changelog.

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