medusa-plugin-bitcoin-lightning-via-clink

Bitcoin Lightning payment module for MedusaJS eCommerce via the CLINK protocol.

Features

• ⚡ Lightning Payments - Accept Bitcoin Lightning payments via CLINK protocol
• 🔒 Self-Custodial - Your node, your funds, no third-party
• 🌐 Nostr-Native - All communication via Nostr relays, no web server needed
• 💱 Auto Conversion - CoinGecko, Kraken, Fixed rate, or Manual
• 🔄 Subscriptions - Auto-renewal via CLINK Debits (nDebit)
• 📱 QR + Copy - Beautiful QR codes with one-click copy for invoices
• 🔐 Privacy - Ephemeral Nostr keys for payment requests
• 🛡️ Dual Confirmation - Webhook (primary) + Polling (backup)
• 📊 Admin Dashboard - Configure everything from the Medusa admin panel

What's in the Box

Component	Description
ClinkPaymentProviderService	Core payment provider with CLINK SDK integration
CurrencyService	Fiat-to-sats conversion (CoinGecko, Kraken, Fixed, Manual)
SubscriptionService	Recurring payments via nDebit protocol
Admin Settings Widget	Configure noffer, currency source, subscriptions, refunds
Storefront Component	QR code + copy + countdown timer + payment status polling
Webhook Endpoint	Real-time payment confirmations from CLINK relay
Status Endpoint	Backup polling for payment verification

Quick Start

1. Install

npm install medusa-plugin-bitcoin-lightning-via-clink

2. Configure

Add to your -config.ts:

import { Modules } from "@medusajs/framework/utils"

module.exports = defineConfig({
  modules: [
    {
      resolve: "@medusajs/medusa/payment",
      options: {
        providers: [
          {
            resolve: "medusa-plugin-bitcoin-lightning-via-clink",
            id: "clink",
            options: {
              noffer: "noffer1...", // Your CLINK offer string
              currencySource: "coingecko",
              invoiceTimeout: 600,
              debug: false
            }
          }
        ]
      }
    }
  ]
})

3. Enable in Admin

1. Go to Settings > Regions
2. Edit your region
3. Enable Lightning (CLINK) as a payment provider

4. Accept Payments!

Customers can now pay with Lightning at checkout.

Documentation

Full documentation lives on the GitHub Wiki:

• Getting Started
• Configuration
• Guide for Merchants
• Guide for Customers
• Guide for Subscriptions
• Currency Sources
• Troubleshooting
• FAQ
• Changelog

How It Works

┌─────────────────────────────────────────────────────────────────┐
│                        CHECKOUT FLOW                             │
├─────────────────────────────────────────────────────────────────┤
│                                                                  │
│  Customer selects "Pay with Lightning"                           │
│       │                                                          │
│       ▼                                                          │
│  Medusa requests invoice                                         │
│       │                                                          │
│       ▼                                                          │
│  CLINK SDK decodes nOffer → requests BOLT11 from your node       │
│       │                                                          │
│       ▼                                                          │
│  QR code + invoice displayed to customer                         │
│       │                                                          │
│       ▼                                                          │
│  Customer scans QR with Lightning wallet                         │
│       │                                                          │
│       ▼                                                          │
│  Payment confirmed via Webhook (primary) OR Polling (backup)     │
│       │                                                          │
│       ▼                                                          │
│  Order confirmed! ⚡                                             │
│                                                                  │
└─────────────────────────────────────────────────────────────────┘

No web server needed for your Lightning node. All communication flows over Nostr. See the Wiki architecture page for the full data flow.

Requirements

• Medusa v2.x
• Node.js >= 18.0.0
• A CLINK-compatible Lightning wallet/node:
  • ShockWallet (iOS/Android/Desktop)
  • Lightning.Pub (self-hosted)
  • ZEUS (iOS/Android)
  • Amethyst (Android)
  • Electrum with CLINK plugin (Desktop)

Configuration Options

Option	Type	Required	Default	Description
noffer	string	Yes	-	Your CLINK offer string
currencySource	string	No	coingecko	Exchange rate source
fixedBtcRate	number	No	-	Fixed BTC rate (if using fixed source)
invoiceTimeout	number	No	600	Invoice expiry in seconds
pollInterval	number	No	5000	Polling interval in ms
enableSubscriptions	boolean	No	false	Enable nDebit subscriptions
merchantPubkey	string	Only for subscriptions	-	Merchant Nostr pubkey (64-hex); required when enableSubscriptions
webhookSecret	string	No	-	HMAC secret to verify webhook payloads (see Security below)
refundContactEmail	string	No	-	Merchant email for refunds
refundContactNostr	string	No	-	Merchant Nostr for refunds
debug	boolean	No	false	Enable debug logging

Security

v1.0.2 hardened the plugin against common payment and network attacks:

• BOLT11 validation - Invoices returned by your node are validated before being shown to customers: mainnet bc prefix, amount matches the requested total, and a reasonable expiry. Invalid invoices are rejected and the payment session is failed.
• SSRF protection - Relay URLs are validated (wss:// only) and IP addresses are checked for safety. Localhost, .local domains, private/loopback/CGNAT/link-local IPs, and unsafe IPv6 ranges (ULA, link-local, multicast, IPv4-mapped) are rejected.
• Webhook signature verification - Confirmations sent to the webhook endpoint are verified with an HMAC-SHA256 signature before the order is confirmed. Set a shared secret and the plugin will reject unsigned or tampered webhooks.
• nDebit validation - Subscription debit pointers are decoded and validated (pubkey, relay) before use. A k1 correlation key ties each debit request to the originating subscription.
• Payment hash correlation - The webhook verifies the payment's payment_hash matches the expected session before confirming the order.

Webhook secret

Two ways to set it (env var takes precedence):

# Option 1: environment variable
CLINK_WEBHOOK_SECRET=your-secret npm start

// Option 2: plugin option
options: {
  webhookSecret: "your-secret"
}

If no secret is configured, webhook signatures are not checked (single-tenant setups behind a firewall). Configure one in production. See the Configuration Wiki page for details.

See the Configuration Wiki page for details on each option.

Supported Wallets

For Merchants (to get your nOffer):

• ShockWallet - Menu > Static Offer
• Lightning.Pub - Dashboard > Offers
• ZEUS - Settings > CLINK

For Customers (to pay):

• ShockWallet
• ZEUS
• Amethyst
• Electrum with CLINK plugin
• Any CLINK-compatible wallet

Development

# Install dependencies
npm install

# Run tests
npm test

# Build
npm run build

# Watch mode
npm run dev

Contributing

Contributions are welcome! Please see CONTRIBUTING.md for details.

License

GPL-3.0 - See LICENSE for details.

Support

• Issues
• Discussions
• CLINK Protocol
• Medusa Documentation

Other Conversations

• In Medusa GH forum: https://github.com/medusajs/medusa/discussions/16162
• In Medusa Discord: https://discord.com/channels/876835651130097704/1529853260276437123