dropcoin invoice for ChatGPT

io.github.freshfos/dropcoin-invoice

German e-invoicing: generate XRechnung 3.0, pre-check and extract (incl. ZUGFeRD PDF). Paid.

client:ChatGPT transport:streamable-http tools:3

Install dropcoin invoice in ChatGPT

Settings → Connectors → Advanced → Developer mode

https://invoice-api.dropcoin.workers.dev/mcp

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