Send invoice
Email an invoice, or a reminder for it, to the contacts that receive it.
MCP tool invoice_ninja_write → send_invoice
write Confirm
Emails the invoice to the contacts ticked to receive it on that invoice and returns who got it. A draft becomes Sent: the client balance goes up by the invoice balance, the invoice appears in the client portal and reminders start counting against the due date. A Sent invoice can be sent again. Template is invoice by default, or reminder1, reminder2, reminder3 or reminder_endless to use the matching template from Settings > Templates & Reminders. A late fee is added only if your reminder settings define one. By default you confirm each call; you can switch that off for this tool.
Parameters
| Name | Type | Description |
|---|---|---|
| company string | string | Company name, for accounts with several companies. Default: the company open when you signed in. |
| invoice_number string required | string | Invoice number from list_invoices or create_invoice, e.g. INV-0038. |
| template enum | enum | invoice, reminder1, reminder2, reminder3 or reminder_endless. Default: invoice. |
tools/call
{
"jsonrpc": "2.0",
"id": 1,
"method": "tools/call",
"params": {
"name": "invoice_ninja_write",
"arguments": {
"operation": "send_invoice",
"arguments": {
"invoice_number": "INV-0038",
"template": "reminder1"
}
}
}
}Example response
{
"content": [
{
"type": "text",
"text": "{ ... same JSON as structuredContent ... }"
}
],
"structuredContent": {
"invoice_number": "INV-0038",
"status": "sent",
"template": "reminder1",
"sent_to": [
"ap@brightwave.example"
],
"sent_at": "2026-10-14T09:00:00+02:00",
"balance": 1800
},
"isError": false
}