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lemon-squeezy-integration

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Full Lemon Squeezy integration — REST API, @lemonsqueezy/lemonsqueezy.js server SDK, Lemon.js checkout overlays, webhooks, custom_data, and subscriptions. Use when integrating Lemon Squeezy billing, checkout, webhooks, LS API, Lemon.js, or subscription provisioning into an application.

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Lemon Squeezy Integration

Official docs: https://docs.lemonsqueezy.com/

Architecture

Three layers — use all three for a production SaaS integration:

LayerToolRuns on
Checkout UXLemon.js + checkout URLsBrowser
Admin / dynamic checkoutREST API or @lemonsqueezy/lemonsqueezy.jsServer only
ProvisioningWebhooksServer endpoint

Never expose LEMONSQUEEZY_API_KEY in client code. The npm SDK is server-only.

Golden rule: Webhooks are the source of truth for granting access. Lemon.js Checkout.Success is UX-only — do not provision solely from client events.

Choose an approach

NeedUse
Static pricing pageDashboard checkout URLs + optional Lemon.js overlay
Per-user checkout with custom dataAppend checkout[custom][user_id] to URL, or create checkout via API
Dynamic pricing / on-demand checkoutServer: createCheckout → open URL with Lemon.js
Grant/revoke access after paymentWebhook handler
Customer billing portalsubscription.urls.update_payment_method from API + Lemon.js overlay

Required environment variables

VariablePurpose
LEMONSQUEEZY_API_KEYServer API auth (Settings → API)
LEMONSQUEEZY_STORE_IDStore ID for checkout creation
LEMONSQUEEZY_WEBHOOK_SECRETVerify incoming webhook X-Signature

Use test mode keys until production. Docs: https://docs.lemonsqueezy.com/help/getting-started/test-mode

End-to-end workflow

1. Store setup

Create products and variants in the LS dashboard (or sync via API). Record store_id, product_id, and variant_id for each plan.

2. Checkout

Static URL:

https://[STORE].lemonsqueezy.com/checkout/buy/[VARIANT_ID]

With user linking (required for webhook provisioning):

?checkout[custom][user_id]=USER_ID&checkout[email]=user@example.com

Overlay: Load Lemon.js, add lemonsqueezy-button class to links, or call LemonSqueezy.Url.Open(url).

Dynamic: Server creates checkout via API/SDK → use data.attributes.url from response.

Share /checkout/buy/ URLs only. Do not share converted /checkout/?cart= URLs — they are single-use per customer.

PocketHost uses custom domain URLs like https://store.pockethost.io/buy/... — see pockethost.md.

3. Webhook endpoint

  1. Register URL in Settings → Webhooks (or via API)
  2. Verify HMAC-SHA256 of the raw request body against X-Signature header
  3. Read meta.event_name and meta.custom_data
  4. Update your database idempotently
  5. Return 200 quickly

Key events: order_created, subscription_created, subscription_updated, subscription_expired, subscription_cancelled, order_refunded, subscription_payment_refunded

4. Persist subscription state

Store at minimum: LS subscription/order id, status, variant_id, renews_at, ends_at, and your internal plan tier mapping.

On refund/expiry/cancel → revoke or decrement access.

Common tasks

Add a new plan

  1. Create variant in LS dashboard
  2. Add checkout URL to frontend (with checkout[custom][user_id])
  3. Add {product_id}-{variant_id} to webhook allowlist and product handler map
  4. Map variant → internal subscription fields

Debug a failed webhook

  1. Confirm webhook URL and signing secret match env
  2. Check LS dashboard webhook log for payload and response
  3. Verify signature uses raw body (not re-serialized JSON)
  4. Confirm meta.custom_data.user_id was passed at checkout
  5. Confirm product/variant ID is in your handler allowlist

Reference files