---
search:
  tags:
    - billing
    - POST
seo:
  description: >-
    Marks an invoice as paid, indicating that payment has been… Reference for
    the POST /billing/invoices/{id}/mark-as-paid endpoint in the Leadtime Public
    API API.
sidebar:
  badge: POST
  label: Mark invoice as paid
title: Mark invoice as paid
type: openapi-operation
---
Marks an invoice as paid, indicating that payment has been received from the customer. This changes the invoice status from "New" or "Sent" to "Paid" and records the payment date and runtime.

**What happens when you mark an invoice as paid:**
1. Invoice status changes to "Paid"
2. Payment date (`paidAt`) is recorded as the current date
3. Payment runtime (`paidRuntime`) is calculated as the number of days between invoice creation and payment
4. Status change timestamp and user are recorded
5. The invoice moves from the "New" or "Overdue" tab to the "Paid" tab

**Important restrictions:**
- Only invoices with status "New" or "Sent" can be marked as paid
- Invoices that are already "Paid" or "Cancelled" cannot be marked as paid
- To revert a paid invoice, use the mark as unpaid endpoint

**Use cases:**
- Record payment received from customer
- Update invoice status after manual payment confirmation
- Track payment timing for financial reporting

**What is returned:**
- Success response confirming the invoice was marked as paid

<Operation source="api-reference" id="invoicescontroller-markaspaid" />