Invoice Ninja — invoicing and payment management

payments

Invoice Ninja is a Claude Code skill that connects the agent to Invoice Ninja, an open-source invoicing and expense tracking platform. Using the Membrane CLI, it lets you manage clients, invoices, payments, credits, quotes, projects, tasks, expenses, vendors, and products — all from within the agent. Authentication and token refresh are handled automatically by Membrane; setup requires running `membrane connection ensure` and completing a browser-based login. Popular actions include `list-invoices`, `create-invoice`, `list-clients`, `create-client`, and many more, discoverable via natural-language intent search. Ideal for freelancers, small businesses, and entrepreneurs looking to automate billing workflows, track expenses, and get paid faster without leaving their coding environment.