Bitcoin Lightning Payment Gateway for WooCommerce (via CLINK)

Description

Accept Bitcoin Lightning Network payments on your WooCommerce store via the CLINK protocol. No web server required for your Lightning node — all communication flows over Nostr relays.

Customers can pay with ShockWallet, ZEUS, Amethyst, or any CLINK-compatible Lightning wallet.

How It Works

1. Merchant generates a CLINK Offer string (noffer1...) from their CLINK-compatible wallet
2. Customer checks out and selects “Lightning (CLINK)” as payment method
3. The plugin uses the noffer to request a BOLT 11 Lightning invoice over Nostr
4. Customer scans the QR code and pays with any Lightning wallet
5. Payment is confirmed via CLINK receipt — order is marked complete

Features

• Supports simple, variable, digital, and subscription products
• Works with both classic checkout and WooCommerce Cart/Checkout Blocks
• Live BTC price via CoinGecko (5-minute cache) or optional fixed rate
• Display prices in sats, BTC, or ₿ (bip-0177) on product pages, cart, and checkout
• Configurable invoice timeout and poll interval
• Automatic sats conversion from your store currency
• QR code display on the order-received page
• Full refund support (manual Lightning refund)
• Compatible with Custom Price for WooCommerce Pro and other price-display plugins
• Client-side price conversion fallback for maximum plugin compatibility

Third Party Services

This plugin communicates with the following third-party services:

Nostr Relays (CLINK Protocol)

• Purpose: Request and receive Lightning invoices from the merchant’s CLINK-compatible wallet
• When: At checkout, when a customer places an order using the CLINK payment method
• Data sent: Merchant’s noffer offer data, payment amount in satoshis, order description, and ephemeral public keys
• Relay URL: Determined by the merchant’s noffer string (configured in the gateway settings)
• Privacy note: No personal customer data (name, email, address) is transmitted to Nostr relays. Only the payment amount and a short order description are shared. Customers choosing wallet-based auto-renewal (ndebit) authorize the merchant to pull future subscription payments; the ndebit string and subscription amount are known to the Nostr relay.

CoinGecko

• Purpose: Fetch the current BTC-to-fiat exchange rate for price display
• When: On checkout page load, every 5 minutes (result is cached in WordPress transients)
• Data sent: The store’s currency code (e.g., usd, eur)
• Privacy policy: https://www.coingecko.com/en/privacy
• Note: If configured, a fixed exchange rate in the plugin settings bypasses this service entirely.

ShockWallet.app

• Purpose: Informational links for customers to generate CLINK noffer/ndebit strings
• When: When the customer clicks the link (no data sent by the plugin automatically)
• Privacy policy: https://docs.shock.network/privacy

Development

Source code for the built JavaScript bundles is included in the plugin:

• assets/js/clink-checkout.js — source for the order-received page bundle
• assets/js/clink-blocks.js — source for the blocks checkout registration
• assets/js/clink-price-converter.js — source for the client-side price conversion fallback
• build.mjs — esbuild configuration
• package.json — npm dependencies