Tax summary webhook `created_at` field now returns UTC timezone

What's new

The created_at field from tax_summaries/create webhook for tax partners will now return timestamps in UTC format with the Z suffix, including millisecond precision.

Action required

Update your parsing logic to handle the new format. The following are examples of the format prior to and after the change:

Versions prior to 2026-01:

{
  "id": 14,
  "shop_id": 1,
  "order_id": 7,
  "created_at": "2025-11-19T08:16:53-05:00",
  "summary": {
    ...
  }
}

Versions 2026-01 and higher.

{
  "id": 14,
  "shop_id": 1,
  "order_id": 7,
  "created_at": "2025-11-19T13:16:53.784Z",
  "summary": {
    ...
  }
}