ChatGPT supports MCP (Model Context Protocol) connectors: point ChatGPT at an MCP server and the model gains real tools over your data. FacturaHub exposes its MCP server at https://api.facturahub.com/mcp with real tools — create invoices, log expenses, check who owes you, pull the P&L or the IVA summary — authenticated via OAuth 2.0 with your account. The result: you tell ChatGPT "invoice the March project to Vertex, €3,500" and the invoice exists, with the right IVA rate, IRPF if applicable and sequential numbering, instantly synced to your dashboard.
How to connect, step by step: (1) in ChatGPT go to Settings → Connectors and enable developer mode (under Advanced; available on Plus/Pro/Team); (2) Create connector → name it "FacturaHub", URL https://api.facturahub.com/mcp, OAuth authentication; (3) authorize with your FacturaHub account when asked; (4) in the chat, enable the connector from the tools menu and talk normally. The same steps work for Claude (claude.ai → Settings → Connectors) and for Claude Desktop/Code with a JSON config — the detail lives in your dashboard, under Integrations.
This is not a chatbot answering questions: it is AI operating your invoicing with real permissions. Everything ChatGPT (or Claude) does via MCP appears instantly in the dashboard, where you review, edit or void it — the AI executes, the last word is yours. And the plan is free: unlimited invoices, expenses, clients, Modelo 303 and Verifactu; only FacturaHub's own AI is metered (25 actions/month free) — using your ChatGPT or your Claude via MCP consumes no FacturaHub tokens.
URL https://api.facturahub.com/mcp, authorize with your account — no keys to copy. Works in ChatGPT, claude.ai, Claude Desktop/Code and Cursor.
create_invoice, get_overdue, get_profit_loss, get_tax_summary, receipt OCR… the AI acts on your data, it does not opine.
Every invoice or expense created from ChatGPT appears instantly in the panel: you supervise and correct it.
Sequential numbering, NIF, correct IVA/IRPF and Verifactu built in for when it becomes mandatory (2027).
MCP connectors require ChatGPT developer mode, available on Plus, Pro and Team plans. FacturaHub itself is free: the single plan has no fee.
No. The model is ChatGPT's (or Claude's): MCP tools execute direct actions on your account and do not spend FacturaHub's 25 monthly AI actions.
Same server, same steps: in claude.ai add the connector under Settings → Connectors, and in Claude Desktop or Claude Code paste a JSON config (ready in your dashboard → Integrations).
Access goes through OAuth 2.0 with your account and you can revoke it anytime. Everything the AI does is visible in the dashboard: nothing happens out of sight.