Dunn for ChatGPT

org.getdunn/dunn

Free invoice tools: due dates from payment terms, late fees, days late, payment reminder emails.

client:ChatGPT transport:streamable-http tools:4

Install Dunn in ChatGPT

Settings → Connectors → Advanced → Developer mode

https://getdunn.org/mcp

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