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Lemon Squeezy is an all-in-one platform for running your SaaS business. It handles payments, subscriptions, global tax compliance, fraud prevention, multi-currency, and more. Here’s how to switch the default payment processor from Stripe to Lemon Squeezy.

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1. Swap out the required dependencies

First, uninstall the existing dependencies from the Payments package…
Terminal
pnpm remove stripe --filter @repo/payments
… and install the new dependencies…
Terminal
pnpm add @lemonsqueezy/lemonsqueezy.js --filter @repo/payments

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2. Update the environment variables

Next, update the environment variables across the project, for example:
apps/app/.env
NEXT_PUBLIC_LEMON_SQUEEZY_API_KEY=""
Additionally, replace all instances of STRIPE_SECRET_KEY with LEMON_SQUEEZY_API_KEY in the packages/env/index.ts file.

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3. Update the payments client

Initialize the payments client in the packages/payments/index.ts file with the new API key. Then, export the lemonSqueezySetup function from the file.
packages/payments/index.ts
import { env } from '@repo/env';
import { lemonSqueezySetup } from '@lemonsqueezy/lemonsqueezy.js';

lemonSqueezySetup({
  apiKey,
  onError: (error) => console.error("Error!", error),
});

export * from '@lemonsqueezy/lemonsqueezy.js';

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4. Update the payments webhook handler

Update the webhook handler for Lemon Squeezy:
apps/api/app/webhooks/payments/route.ts
import { NextResponse } from 'next/server';

export const POST = async (request: Request) => {
  return NextResponse.json({ message: 'Hello World' });
};
There’s quite a lot you can do with Lemon Squeezy, so check out the following resources for more information:

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5. Use Lemon Squeezy in your app

Finally, use the new payments client in your app.
apps/app/app/(authenticated)/page.tsx
import { getStore } from '@repo/payments';

const Page = async () => {
  const store = await getStore(123456);

  return (
    <pre>{JSON.stringify(store, null, 2)}</pre>
  );
};