InvoiceXML for ChatGPT

com.invoicexml/invoicexml

Create, validate, convert & extract compliant e-invoices (UBL, Factur-X, ZUGFeRD, XRechnung)

client:ChatGPT transport:streamable-http

Install InvoiceXML in ChatGPT

Settings → Connectors → Advanced → Developer mode

https://mcp.invoicexml.com

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