InvoiceIn for ChatGPT

io.github.peculiar-systems/invoicein

XRechnung, Factur-X, Peppol, PINT AE, FatturaPA, KSeF → JSON + fix hints. Hosted; MIT=examples only

client:ChatGPT transport:streamable-http tools:5

Install InvoiceIn in ChatGPT

Settings → Connectors → Advanced → Developer mode

https://invoicein-api.peculiar.systems/mcp

Custom connectors are a paid-plan feature and take a remote URL only. ChatGPT cannot run a packaged server locally. ChatGPT docs