Add Bitcoin Lightning checkout to your Rails app and receive payments directly into a wallet you control. Mount the engine, connect a receive-only Nostr Wallet Connect (NWC) wallet, and wire up three hooks for authorization, order amounts, and fulfillment. Optional swaps let customers pay with USDT, USDC, SOL, and ETH through a configured provider; you receive BTC over Lightning in your wallet. Available assets and networks depend on the provider. OpenReceive handles invoices, payment attempts, and settlement reconciliation using your existing application database. Keep your orders, users, prices, and fulfillment in your app, with no separate OpenReceive database, Redis, or payment service to deploy. Includes an install generator, PostgreSQL, SQLite, and MySQL support, plus an optional wallet-notifications worker.