invoicehub for ChatGPT

dev.invoicehub/invoicehub

Validate, generate & convert EU e-invoices (UBL, CII, XRechnung, Factur-X) — EN 16931 pre-validated.

client:ChatGPT transport:streamable-http tools:4

Install invoicehub in ChatGPT

Settings → Connectors → Advanced → Developer mode

https://api.invoicehub.dev/mcp

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