Send a payment reminder
Emails the customer that an invoice is still open and attaches the invoice again.
POST https://cotlet.dev/api/v1/snelstart/invoices/{invoice_id}/reminder
write Confirm
Does what the Herinnering button on an open invoice does, from the inStap package. It works for a regular invoice only, not for an e-invoice, and the call returns an error for an invoice that is already paid. The customer receives the email. By default you confirm each call; you can switch that off for this tool.
Parameters
| Name | Type | Description |
|---|---|---|
| invoice_id string required | string | Sales invoice ID from list_sales_invoices or create_sales_invoice. |
Request
curl -X POST https://cotlet.dev/api/v1/snelstart/invoices/inv_2026_0388/reminder \
-H "Authorization: Bearer $COTLET_API_KEY"result = client.call("snelstart", "send_invoice_reminder", {"invoice_id":"inv_2026_0388"})const result = await cotlet.call('snelstart', 'send_invoice_reminder', {"invoice_id":"inv_2026_0388"});cotlet call snelstart send_invoice_reminder --data '{"invoice_id":"inv_2026_0388"}'Example response
{
"invoice_id": "inv_2026_0388",
"number": "2026-0388",
"reminder_sent_to": "ap@bakker.example",
"sent_at": "2026-10-14T09:12:00+02:00"
}