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+# Polar SDK Usage
+
+Multi-language SDKs and framework adapters.
+
+## TypeScript/JavaScript
+
+**Installation:**
+```bash
+npm install @polar-sh/sdk
+```
+
+**Configuration:**
+```typescript
+import { Polar } from '@polar-sh/sdk';
+
+const polar = new Polar({
+  accessToken: process.env.POLAR_ACCESS_TOKEN,
+  server: "production" // or "sandbox"
+});
+```
+
+**Usage:**
+```typescript
+// Products
+const products = await polar.products.list({ organization_id: "org_xxx" });
+const product = await polar.products.create({ name: "Pro Plan", ... });
+
+// Checkouts
+const checkout = await polar.checkouts.create({
+  product_price_id: "price_xxx",
+  success_url: "https://example.com/success"
+});
+
+// Subscriptions
+const subs = await polar.subscriptions.list({ customer_id: "cust_xxx" });
+await polar.subscriptions.update(subId, { metadata: { plan: "pro" } });
+
+// Orders
+const orders = await polar.orders.list({ organization_id: "org_xxx" });
+const order = await polar.orders.get(orderId);
+
+// Customers
+const customer = await polar.customers.get({ external_id: "user_123" });
+
+// Events (usage-based)
+await polar.events.create({
+  external_customer_id: "user_123",
+  event_name: "api_call",
+  properties: { tokens: 1000 }
+});
+```
+
+**Pagination:**
+```typescript
+// Automatic pagination
+for await (const product of polar.products.listAutoPaging()) {
+  console.log(product.name);
+}
+
+// Manual pagination
+let page = 1;
+while (true) {
+  const response = await polar.products.list({ page, limit: 100 });
+  if (response.items.length === 0) break;
+  // Process items
+  page++;
+}
+```
+
+## Python
+
+**Installation:**
+```bash
+pip install polar-sdk
+```
+
+**Configuration:**
+```python
+from polar_sdk import Polar
+
+polar = Polar(
+    access_token=os.environ["POLAR_ACCESS_TOKEN"],
+    server="production"  # or "sandbox"
+)
+```
+
+**Sync Usage:**
+```python
+# Products
+products = polar.products.list(organization_id="org_xxx")
+product = polar.products.create(name="Pro Plan", ...)
+
+# Checkouts
+checkout = polar.checkouts.create(
+    product_price_id="price_xxx",
+    success_url="https://example.com/success"
+)
+
+# Subscriptions
+subs = polar.subscriptions.list(customer_id="cust_xxx")
+polar.subscriptions.update(sub_id, metadata={"plan": "pro"})
+
+# Orders
+orders = polar.orders.list(organization_id="org_xxx")
+order = polar.orders.get(order_id)
+
+# Events
+polar.events.create(
+    external_customer_id="user_123",
+    event_name="api_call",
+    properties={"tokens": 1000}
+)
+```
+
+**Async Usage:**
+```python
+import asyncio
+from polar_sdk import AsyncPolar
+
+async def main():
+    polar = AsyncPolar(access_token=os.environ["POLAR_ACCESS_TOKEN"])
+
+    products = await polar.products.list(organization_id="org_xxx")
+    checkout = await polar.checkouts.create(...)
+
+asyncio.run(main())
+```
+
+## PHP
+
+**Installation:**
+```bash
+composer require polar-sh/sdk
+```
+
+**Configuration:**
+```php
+use Polar\Polar;
+
+$polar = new Polar(
+    accessToken: $_ENV['POLAR_ACCESS_TOKEN'],
+    server: 'production' // or 'sandbox'
+);
+```
+
+**Usage:**
+```php
+// Products
+$products = $polar->products->list(['organization_id' => 'org_xxx']);
+$product = $polar->products->create(['name' => 'Pro Plan', ...]);
+
+// Checkouts
+$checkout = $polar->checkouts->create([
+    'product_price_id' => 'price_xxx',
+    'success_url' => 'https://example.com/success'
+]);
+
+// Subscriptions
+$subs = $polar->subscriptions->list(['customer_id' => 'cust_xxx']);
+$polar->subscriptions->update($subId, ['metadata' => ['plan' => 'pro']]);
+
+// Orders
+$orders = $polar->orders->list(['organization_id' => 'org_xxx']);
+$order = $polar->orders->get($orderId);
+
+// Events
+$polar->events->create([
+    'external_customer_id' => 'user_123',
+    'event_name' => 'api_call',
+    'properties' => ['tokens' => 1000]
+]);
+```
+
+## Go
+
+**Installation:**
+```bash
+go get github.com/polarsource/polar-go
+```
+
+**Usage:**
+```go
+import (
+    "github.com/polarsource/polar-go"
+)
+
+client := polar.NewClient(
+    polar.WithAccessToken(os.Getenv("POLAR_ACCESS_TOKEN")),
+    polar.WithEnvironment("production"),
+)
+
+// Products
+products, err := client.Products.List(ctx, &polar.ProductListParams{
+    OrganizationID: "org_xxx",
+})
+
+// Checkouts
+checkout, err := client.Checkouts.Create(ctx, &polar.CheckoutCreateParams{
+    ProductPriceID: "price_xxx",
+    SuccessURL:     "https://example.com/success",
+})
+```
+
+## Framework Adapters
+
+### Next.js (@polar-sh/nextjs)
+
+**Quick Start:**
+```bash
+npx polar-init
+```
+
+**Configuration:**
+```typescript
+// lib/polar.ts
+import { PolarClient } from '@polar-sh/nextjs';
+
+export const polar = new PolarClient({
+  accessToken: process.env.POLAR_ACCESS_TOKEN!,
+  webhookSecret: process.env.POLAR_WEBHOOK_SECRET!
+});
+```
+
+**Checkout Handler:**
+```typescript
+// app/actions/checkout.ts
+'use server'
+
+import { polar } from '@/lib/polar';
+
+export async function createCheckout(priceId: string) {
+  const session = await polar.checkouts.create({
+    product_price_id: priceId,
+    success_url: `${process.env.NEXT_PUBLIC_URL}/success?checkout_id={CHECKOUT_ID}`
+  });
+
+  return session.url;
+}
+```
+
+**Webhook Handler:**
+```typescript
+// app/api/webhook/polar/route.ts
+import { polar } from '@/lib/polar';
+
+export async function POST(req: Request) {
+  const event = await polar.webhooks.validate(req);
+
+  switch (event.type) {
+    case 'order.paid':
+      await handleOrderPaid(event.data);
+      break;
+    // ... other events
+  }
+
+  return Response.json({ received: true });
+}
+```
+
+### Laravel (polar-sh/laravel)
+
+**Installation:**
+```bash
+composer require polar-sh/laravel
+php artisan vendor:publish --tag=polar-config
+php artisan vendor:publish --tag=polar-migrations
+php artisan migrate
+```
+
+**Configuration:**
+```php
+// config/polar.php
+return [
+    'access_token' => env('POLAR_ACCESS_TOKEN'),
+    'webhook_secret' => env('POLAR_WEBHOOK_SECRET'),
+];
+```
+
+**Checkout:**
+```php
+use Polar\Facades\Polar;
+
+Route::post('/checkout', function (Request $request) {
+    $checkout = Polar::checkouts()->create([
+        'product_price_id' => $request->input('price_id'),
+        'success_url' => route('checkout.success'),
+        'external_customer_id' => auth()->id(),
+    ]);
+
+    return redirect($checkout['url']);
+});
+```
+
+**Webhook:**
+```php
+use Polar\Events\WebhookReceived;
+
+// app/Listeners/PolarWebhookHandler.php
+class PolarWebhookHandler
+{
+    public function handle(WebhookReceived $event)
+    {
+        match ($event->payload['type']) {
+            'order.paid' => $this->handleOrderPaid($event->payload['data']),
+            'subscription.revoked' => $this->handleRevoked($event->payload['data']),
+            default => null,
+        };
+    }
+}
+```
+
+### Express
+
+```javascript
+const express = require('express');
+const { Polar } = require('@polar-sh/sdk');
+const { validateEvent } = require('@polar-sh/sdk/webhooks');
+
+const app = express();
+const polar = new Polar({ accessToken: process.env.POLAR_ACCESS_TOKEN });
+
+app.use(express.json());
+
+app.post('/checkout', async (req, res) => {
+  const session = await polar.checkouts.create({
+    product_price_id: req.body.priceId,
+    success_url: 'https://example.com/success',
+    external_customer_id: req.user.id
+  });
+
+  res.json({ url: session.url });
+});
+
+app.post('/webhook/polar', (req, res) => {
+  const event = validateEvent(
+    req.body,
+    req.headers,
+    process.env.POLAR_WEBHOOK_SECRET
+  );
+
+  handleEvent(event);
+  res.json({ received: true });
+});
+```
+
+### Remix
+
+```typescript
+import { Polar } from '@polar-sh/sdk';
+
+const polar = new Polar({ accessToken: process.env.POLAR_ACCESS_TOKEN });
+
+export async function action({ request }: ActionFunctionArgs) {
+  const formData = await request.formData();
+  const priceId = formData.get('priceId');
+
+  const session = await polar.checkouts.create({
+    product_price_id: priceId,
+    success_url: `${request.url}/success`
+  });
+
+  return redirect(session.url);
+}
+```
+
+## BetterAuth Integration
+
+**Installation:**
+```bash
+npm install @polar-sh/better-auth
+```
+
+**Configuration:**
+```typescript
+import { betterAuth } from 'better-auth';
+import { polarPlugin } from '@polar-sh/better-auth';
+
+export const auth = betterAuth({
+  database: db,
+  plugins: [
+    polarPlugin({
+      organizationId: process.env.POLAR_ORG_ID!,
+      accessToken: process.env.POLAR_ACCESS_TOKEN!
+    })
+  ]
+});
+```
+
+**Features:**
+- Auto-create Polar customers on signup
+- Automatic external_id mapping
+- User-customer sync
+- Access customer data in auth session
+
+## Error Handling
+
+**TypeScript:**
+```typescript
+try {
+  const product = await polar.products.get(productId);
+} catch (error) {
+  if (error.statusCode === 404) {
+    console.error('Product not found');
+  } else if (error.statusCode === 429) {
+    console.error('Rate limit exceeded');
+  } else {
+    console.error('API error:', error.message);
+  }
+}
+```
+
+**Python:**
+```python
+from polar_sdk.exceptions import PolarException
+
+try:
+    product = polar.products.get(product_id)
+except PolarException as e:
+    if e.status_code == 404:
+        print("Product not found")
+    elif e.status_code == 429:
+        print("Rate limit exceeded")
+    else:
+        print(f"API error: {e.message}")
+```
+
+## Best Practices
+
+1. **Environment Variables:** Store credentials securely
+2. **Error Handling:** Catch and handle API errors appropriately
+3. **Rate Limiting:** Implement backoff for 429 responses
+4. **Pagination:** Use auto-paging for large datasets
+5. **Webhooks:** Always verify signatures
+6. **Testing:** Use sandbox for development
+7. **Logging:** Log API calls for debugging
+8. **Retry Logic:** Implement for transient failures