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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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Get the api key

After you have created your account for Lemonsqueezy, you will need to get the API key. You can do this by going to the API page in the dashboard. Here you will find the Secret key and the Publishable key. You will need the Secret key for the integration to work.

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Add environment variables

To use the Lemonsqueezy integration, you need to define the following environment variables to your .env.local as well as your production environment:
.env.local
LEMON_SQUEEZY_API_KEY=
LEMON_SQUEEZY_WEBHOOK_SECRET=

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In-App Purchases

You can use Lemonsqueezy anywhere in your application by importing a lemonsqueezy object:
page.tsx
import { lemonsqueezy } from '@repo/payments';

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Creating a Checkout Session

We need to create a checkout session to charge your users , and you only need modify some code. It consists of two parts:
  • Client
It sends a request to create a session to the /api/lemonsqueezy/checkout endpoint.
apps/web/[locale]/components/payment/price-form.tsx
      const response = await fetch('/api/lemonsqueezy/checkout', { // change to `/api/lemonsqueezy/checkout`
        method: 'POST',
        body: JSON.stringify({
          priceId: item.priceId,
          interval: item.interval,
        }),
      });
  • Server
Implementing business logic in apps/web/api/lemonsqueezy/checkout/route.ts.
Lemonsqueezy allows using the product’s Purchase Link without creating a checkout session through the API.

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Webhooks

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Create a webhook

To configure a new webhook, go to the Webhooks page in the lemonsqueezy dashboard. Click the Add endpoint button and select at least the following events: For subscriptions:
  • subscription_created
  • subscription_updated
  • subscription_cancelled
For one-off payments:
  • order_created
You will also have to enter a Signing secret which you can get by running the following command in your terminal:
Terminal
openssl rand -base64 32

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Webhook Handler

Stripe webhooks are handled in the POST /webhooks/lemonsqueezy route in the apps/api app. This route constructs the event and then switches on the event type to determine how to process the event.
We have implemented the basic structure of the Webhook handler for you. You can modify it as needed.
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