Connect Claude or ChatGPT via MCP to wFirma invoicing and KSeF

## Connect AI to wFirma with an MCP server Give Claude, ChatGPT or any MCP client access to wFirma, the Polish invoicing, accounting and warehouse service. The 9 tools cover ~40 modules and ~140 API actions. ### How it works 1. MCP Server Trigger with *n8n User Auth (OAuth2)*: people sign in with their n8n account. 2. Tools call the gateway in this same workflow ($workflow.id), so you import a single file. 3. Plan builds the URL. Route sends the call to the API, the approval guard or the docs. 4. To XML / Parse XML translate between JSON and wFirma's XML; Format result returns ok, status, records, pagination. 5. wfirma_docs reads the official API docs live, so the model learns field names before writing. ### Safety Deleting, e-mailing invoices, fiscalization and final invoices (KSeF, irreversible) need confirmed=true, which the model may set only after the user approved. Drafts and pro forma invoices go through directly.