API ChangeLog - April 2026

April 27th, 2026

Invoice Date Validation Enforcement

We’ve introduced stricter validation on invoice issue_date to align with NRS requirements.

What Changed

Invoices can now only be created with the current date.
Back-dated and future-dated invoices are no longer allowed.

Affected Endpoints

POST /invoices
POST /detailed-invoices
POST /credit-notes
POST /debit-notes
POST /credit-notes-with-item-codes
POST /debit-notes-with-item-codes

Error Response

Requests with an invalid issue_date will return:

{
  "message": "issue_date NRS does not support back-dating or future-dating of invoices.",
  "code": "400",
  "metadata": {
    "argument": "issue_date"
  }
}

Impact

This is a breaking change.
Any existing integrations that submit invoices with past or future dates will fail.

Recommended Action

Ensure your system always sets issue_date to the current date at the time of invoice creation.
Review and update any workflows that rely on backdating or scheduling invoices.