Connects Claude directly to your BTCPay Server instance through the Greenfield REST API. You get 21 tools covering the full merchant payment stack: create and track invoices, manage stores and payment methods, set up pull payments for donations or subscriptions, configure webhooks for payment notifications, and handle refunds. Also exposes Lightning node operations (channels, balances, peer info) and on-chain wallet management. This fills the merchant payment gap that blockchain data servers don't touch. If you're running BTCPay and want your AI to handle payment processing tasks instead of just querying the blockchain, this is the only MCP server built for that workflow.