Added Next.js example with Webhooks, Customer Portal and Checkout creation

with-nextjs/.env.example

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+# create an organization access token from your organization settings in Polar.
+# SANDBOX
+NEXT_PUBLIC_SANDBOX_POLAR_ACCESS_TOKEN=
+POLAR_SANDBOX_WEBHOOK_SECRET=
+
+# PRODUCTION
+POLAR_ACCESS_TOKEN=
+POLAR_WEBHOOK_SECRET=
+
+# SERVER
+NODE_ENV=
+
+# client url
+SUCCESS_URL=

with-nextjs/.gitignore

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+# See https://help.github.com/articles/ignoring-files/ for more about ignoring files.
+
+# dependencies
+/node_modules
+/.pnp
+.pnp.*
+.yarn/*
+!.yarn/patches
+!.yarn/plugins
+!.yarn/releases
+!.yarn/versions
+
+# testing
+/coverage
+
+# next.js
+/.next/
+/out/
+
+# production
+/build
+
+# misc
+.DS_Store
+*.pem
+
+# debug
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+.pnpm-debug.log*
+
+# env files (can opt-in for committing if needed)
+.env
+
+# vercel
+.vercel
+
+# typescript
+*.tsbuildinfo
+next-env.d.ts

with-nextjs/.prettierignore

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+node_modules
+.env
+README.md

with-nextjs/.prettierrc.json

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+{
+  "semi": false,
+  "printWidth": 180,
+  "singleQuote": true
+}

with-nextjs/README.md

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+<img width="255" height="75" alt="image" src="https://github.com/user-attachments/assets/5f6f176d-661a-45ed-b661-b4d8383e63c6" />
+
+
+#  Getting started with Polar and Next.JS
+
+# Clone the repository
+
+```bash
+git clone https://github.com/polarsource/examples.git
+cd with-nextjs
+```
+# How to use
+
+Run the command below to copy the .env.example file:
+
+```bash
+cp .env.example .env
+```
+
+Get your Polar credentials
+```bash
+Polar_ACCESS_TOKEN
+POLAR_WEBHOOK_SECRET
+```
+
+Run the command below to install project dependencies:
+```bash
+npm install
+# install the dependencies
+
+```
+Run the Next.js application using the following command:
+```bash
+npm run dev
+# run the project
+```

with-nextjs/app/api/checkout/route.ts

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+import { polar } from '@/app/polar'
+import { NextRequest, NextResponse } from 'next/server'
+
+export async function POST(req: NextRequest) {
+  try {
+    const body = await req.json()
+    const { productId } = body
+
+    if (!productId) {
+      return NextResponse.json({ message: 'productId is required.' }, { status: 400 })
+    }
+
+    const checkout = await polar.checkouts.create({
+      products: [productId],
+      successUrl: process.env.SUCCESS_URL,
+    })
+
+    return NextResponse.json(
+      {
+        checkoutUrl: checkout.url,
+        message: 'Checkout successful.',
+      },
+      { status: 200 },
+    )
+  } catch (error) {
+    console.error('Error in checkout API:', error)
+    return NextResponse.json({ message: 'Internal server error' }, { status: 500 })
+  }
+}

with-nextjs/app/api/customer-portal/route.ts

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+// app/api/customer-portal/route.ts
+
+import { polar } from '@/app/polar'
+import { NextRequest, NextResponse } from 'next/server'
+
+async function getOrCreateCustomer(email: string) {
+  try {
+    const existingCustomers = await polar.customers.list({ email: email, limit: 1 })
+
+    if (existingCustomers.result.items.length > 0) {
+      const customerId = existingCustomers.result.items[0].id
+      return { customer_id: customerId, message: 'Customer found.' }
+    }
+
+    const newCustomer = await polar.customers.create({ email })
+    return {
+      customer_id: newCustomer?.id,
+      message: 'Customer created successfully.',
+    }
+  } catch (error) {
+    console.error('Failed to get or create customer', error)
+    return {
+      customer_id: null,
+      message: 'Customer operation was unsuccessful.',
+    }
+  }
+}
+
+export async function POST(req: NextRequest) {
+  try {
+    let email: string | null = null
+
+    try {
+      const body = await req.json()
+      email = body.email
+    } catch (error) { }
+
+    if (!email) {
+      email = req.nextUrl.searchParams.get('email')
+    }
+
+    if (!email) {
+      return NextResponse.json(
+        { message: 'Email is required' },
+        { status: 400 },
+      )
+    }
+
+    const { customer_id, message }: any = await getOrCreateCustomer(email)
+    if (!customer_id) {
+      return NextResponse.json(
+        { message, customerId: customer_id },
+        { status: 400 },
+      )
+    }
+
+    const customerSession = await polar.customerSessions.create({
+      customerId: customer_id,
+    })
+
+    const portalUrl = customerSession.customerPortalUrl
+
+    if (!portalUrl || typeof portalUrl !== 'string') {
+      console.error(
+        'Error: customerPortalUrl from Polar SDK was not a string.',
+        portalUrl,
+      )
+      return NextResponse.json(
+        { message: 'Internal server error: Could not retrieve a valid portal URL.' },
+        { status: 500 },
+      )
+    }
+
+    return NextResponse.json(
+      { customerPortalUrl: portalUrl, customerId: customer_id, message },
+      { status: 201 },
+    )
+  } catch (error) {
+    console.log('Error in customer portal.', error)
+    return NextResponse.json(
+      { message: 'Error in customer portal.' },
+      { status: 500 },
+    )
+  }
+}
+

with-nextjs/app/api/products/route.ts

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+// app/api/products/route.ts
+
+import { polar } from '@/app/polar'
+import { NextResponse } from 'next/server'
+
+// This is a server-side-only function. It can safely access all your secrets.
+export async function GET() {
+    try {
+        const products = await polar.products.list({ isArchived: false })
+        return NextResponse.json(products?.result?.items ?? [])
+    } catch (error) {
+        // If something goes wrong on the server, we'll see it in the Vercel logs.
+        console.error('API Error: Failed to fetch Polar products:', error)
+        return NextResponse.json(
+            { message: 'Internal Server Error' },
+            { status: 500 },
+        )
+    }
+}

with-nextjs/app/api/webhooks/polar/route.ts

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+import { Webhooks } from '@polar-sh/nextjs'
+import { NextResponse } from 'next/server'
+
+export const POST = async () => {
+  const token = process.env.NODE_ENV === 'production' ? process.env.POLAR_WEBHOOK_SECRET : process.env.POLAR_SANDBOX_WEBHOOK_SECRET
+  if (!token) {
+    return NextResponse.json({ message: 'Polar web secret is not found.' }, { status: 400 })
+  }
+  Webhooks({
+    webhookSecret: process.env.POLAR_WEBHOOK_SECRET!,
+
+    // onPayload: async (payload) => {
+    // Handle the payload
+    // },
+    // onOrderPaid: async (event) => { },
+
+  })
+
+  return NextResponse.json({}, { status: 200 })
+}

with-nextjs/app/globals.css

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+@import 'tailwindcss';
+@import 'tw-animate-css';
+
+@custom-variant dark (&:is(.dark *));
+
+@theme inline {
+  --color-background: var(--background);
+  --color-foreground: var(--foreground);
+  --font-sans: var(--font-geist-sans);
+  --font-mono: var(--font-geist-mono);
+  --color-sidebar-ring: var(--sidebar-ring);
+  --color-sidebar-border: var(--sidebar-border);
+  --color-sidebar-accent-foreground: var(--sidebar-accent-foreground);
+  --color-sidebar-accent: var(--sidebar-accent);
+  --color-sidebar-primary-foreground: var(--sidebar-primary-foreground);
+  --color-sidebar-primary: var(--sidebar-primary);
+  --color-sidebar-foreground: var(--sidebar-foreground);
+  --color-sidebar: var(--sidebar);
+  --color-chart-5: var(--chart-5);
+  --color-chart-4: var(--chart-4);
+  --color-chart-3: var(--chart-3);
+  --color-chart-2: var(--chart-2);
+  --color-chart-1: var(--chart-1);
+  --color-ring: var(--ring);
+  --color-input: var(--input);
+  --color-border: var(--border);
+  --color-destructive: var(--destructive);
+  --color-accent-foreground: var(--accent-foreground);
+  --color-accent: var(--accent);
+  --color-muted-foreground: var(--muted-foreground);
+  --color-muted: var(--muted);
+  --color-secondary-foreground: var(--secondary-foreground);
+  --color-secondary: var(--secondary);
+  --color-primary-foreground: var(--primary-foreground);
+  --color-primary: var(--primary);
+  --color-popover-foreground: var(--popover-foreground);
+  --color-popover: var(--popover);
+  --color-card-foreground: var(--card-foreground);
+  --color-card: var(--card);
+  --radius-sm: calc(var(--radius) - 4px);
+  --radius-md: calc(var(--radius) - 2px);
+  --radius-lg: var(--radius);
+  --radius-xl: calc(var(--radius) + 4px);
+}
+
+:root {
+  --radius: 0.625rem;
+  --background: oklch(1 0 0);
+  --foreground: oklch(0.145 0 0);
+  --card: oklch(1 0 0);
+  --card-foreground: oklch(0.145 0 0);
+  --popover: oklch(1 0 0);
+  --popover-foreground: oklch(0.145 0 0);
+  --primary: oklch(0.205 0 0);
+  --primary-foreground: oklch(0.985 0 0);
+  --secondary: oklch(0.97 0 0);
+  --secondary-foreground: oklch(0.205 0 0);
+  --muted: oklch(0.97 0 0);
+  --muted-foreground: oklch(0.556 0 0);
+  --accent: oklch(0.97 0 0);
+  --accent-foreground: oklch(0.205 0 0);
+  --destructive: oklch(0.577 0.245 27.325);
+  --border: oklch(0.922 0 0);
+  --input: oklch(0.922 0 0);
+  --ring: oklch(0.708 0 0);
+  --chart-1: oklch(0.646 0.222 41.116);
+  --chart-2: oklch(0.6 0.118 184.704);
+  --chart-3: oklch(0.398 0.07 227.392);
+  --chart-4: oklch(0.828 0.189 84.429);
+  --chart-5: oklch(0.769 0.188 70.08);
+  --sidebar: oklch(0.985 0 0);
+  --sidebar-foreground: oklch(0.145 0 0);
+  --sidebar-primary: oklch(0.205 0 0);
+  --sidebar-primary-foreground: oklch(0.985 0 0);
+  --sidebar-accent: oklch(0.97 0 0);
+  --sidebar-accent-foreground: oklch(0.205 0 0);
+  --sidebar-border: oklch(0.922 0 0);
+  --sidebar-ring: oklch(0.708 0 0);
+}
+
+.dark {
+  --background: oklch(0.145 0 0);
+  --foreground: oklch(0.985 0 0);
+  --card: oklch(0.205 0 0);
+  --card-foreground: oklch(0.985 0 0);
+  --popover: oklch(0.205 0 0);
+  --popover-foreground: oklch(0.985 0 0);
+  --primary: oklch(0.922 0 0);
+  --primary-foreground: oklch(0.205 0 0);
+  --secondary: oklch(0.269 0 0);
+  --secondary-foreground: oklch(0.985 0 0);
+  --muted: oklch(0.269 0 0);
+  --muted-foreground: oklch(0.708 0 0);
+  --accent: oklch(0.269 0 0);
+  --accent-foreground: oklch(0.985 0 0);
+  --destructive: oklch(0.704 0.191 22.216);
+  --border: oklch(1 0 0 / 10%);
+  --input: oklch(1 0 0 / 15%);
+  --ring: oklch(0.556 0 0);
+  --chart-1: oklch(0.488 0.243 264.376);
+  --chart-2: oklch(0.696 0.17 162.48);
+  --chart-3: oklch(0.769 0.188 70.08);
+  --chart-4: oklch(0.627 0.265 303.9);
+  --chart-5: oklch(0.645 0.246 16.439);
+  --sidebar: oklch(0.205 0 0);
+  --sidebar-foreground: oklch(0.985 0 0);
+  --sidebar-primary: oklch(0.488 0.243 264.376);
+  --sidebar-primary-foreground: oklch(0.985 0 0);
+  --sidebar-accent: oklch(0.269 0 0);
+  --sidebar-accent-foreground: oklch(0.985 0 0);
+  --sidebar-border: oklch(1 0 0 / 10%);
+  --sidebar-ring: oklch(0.556 0 0);
+}
+
+@layer base {
+  * {
+    @apply border-border outline-ring/50;
+  }
+  body {
+    @apply bg-background text-foreground;
+  }
+}