The full upstream README, mirrored here for reference. Install config, tool schemas, adoption signals, and an original overview live on the Billingengine MCP listing page.
Create customers and invoices, look up open invoices and record payments in BillingEngine by talking to Claude, Cursor or any other MCP client:
"Create an invoice for Acme Painting over 100 euros."
"Which invoices are overdue?"
"Acme paid invoice 2610030028, record the payment."
BillingEngine is invoicing software for freelancers and small businesses with e-invoicing (EN 16931, XRechnung, ZUGFeRD / Factur-X). The server is a thin layer over the BillingEngine API and runs on your computer.
Add this to claude_desktop_config.json:
Use the same command, args and env as above in the MCP settings of your client.
| Tool | What it does |
|---|---|
find_customers | Searches customers by company, name or email |
create_customer | Creates a customer |
update_customer | Changes a customer |
create_invoice | Creates a draft invoice for a customer |
update_invoice | Changes a draft invoice |
list_invoices | Lists invoices, filtered by status, customer, number or date |
get_invoice | Returns one invoice with items and payment status |
download_invoice | Saves the PDF or the XML e-invoice to your Downloads folder |
record_payment | Records a payment for sent invoices |
list_payments | Lists payments, optionally for one invoice |
If a key is ever exposed, generate a new one under Settings > API. The old key stops working immediately. The settings also show when the key was last used.
| Variable | Meaning |
|---|---|
BILLINGENGINE_API_KEY | Your API key (required) |
BILLINGENGINE_URL | Base URL, defaults to https://www.billingengine.com |
MIT. BillingEngine itself is a commercial service; see billingengine.com.