Invoices your agent can make

Example link:

https://invoicewebsite.com/create-invoice?prefill=%5B%7B%22description%22%3A%22Website+design%22%2C%22quantity%22%3A1%2C%22rate%22%3A1200%7D%2C%7B%22description%22%3A%22Hosting+%28monthly%29%22%2C%22quantity%22%3A3%2C%22rate%22%3A25%7D%5D&clientName=Acme+Co&clientEmail=billing%40acme.example&currency=USD&terms=net30

Use /create-estimate with the same parameters to start an estimate instead.

• set_client Fill in the client name, email, and address
• add_line_items Add one or more line items with quantity and rate
• set_dates_and_terms Set the date, due date, and payment terms
• set_currency Change the document currency
• add_tax_line Add a named tax with a percentage
• set_notes Set the notes shown on the document
• choose_template Switch to another template
• get_invoice_summary Read back the current totals and fields
• save_document Save the invoice or estimate to the account

The payment due date calculator and the estimate builder pages also register tools. Every editor field has a label and a stable name, so agents that read the page can fill it in without WebMCP.

Create an invoice:

curl -X POST https://invoicewebsite.com/api/v1/invoices \
  -H "Authorization: Bearer iw_live_your_key" \
  -H "Content-Type: application/json" \
  -d '{
    "client": { "name": "Acme Co", "email": "billing@acme.example" },
    "items": [{ "description": "Website design", "quantity": 1, "rate": 1200 }],
    "currency": "USD",
    "terms": "net30"
  }'

Email the client a link to view it:

curl -X POST https://invoicewebsite.com/api/v1/invoices/INVOICE_ID/send \
  -H "Authorization: Bearer iw_live_your_key"

Full reference: Agent API docs. Machine-readable description: openapi.json.