Billify MCP by usefulapi for ChatGPT

io.usefulapi/billify

Read clients, offers and invoices; create clients and offer drafts in Billify.

client:ChatGPT transport:streamable-http tools:8

Install Billify MCP by usefulapi in ChatGPT

Settings → Connectors → Advanced → Developer mode

https://billify.usefulapi.io/mcp

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