---
title: "Changes to GET /v1/contactBooks/{contactBookId}"
method: GET
path: "/v1/contactBooks/{contactBookId}"
---

# Changes to GET /v1/contactBooks/{contactBookId}

`GET /v1/contactBooks/{contactBookId}`

> Every recorded change to this endpoint, newest first.

## Timeline

Changed in 4 of 27 revisions.

- **2026-07-17** `ee7832fe66a6` — 2 info
- **2026-02-28** `1bc45cd7b94e` — 4 info
- **2026-01-17** `da09bf6f14b1` — 1 info
- **2024-05-21** `ad91eadfd8ee` — 1 breaking

## Changes

- **2026-07-17** `ee7832fe66a6` — 2 info
  - the response property `_count/contacts` became required for the status `200`
  - added the required property `variables` to the response with the `200` status
- **2026-02-28** `1bc45cd7b94e` — 4 info
  - added the optional property `doubleOptInContent` to the response with the `200` status
  - added the optional property `doubleOptInEnabled` to the response with the `200` status
  - added the optional property `doubleOptInFrom` to the response with the `200` status
  - added the optional property `doubleOptInSubject` to the response with the `200` status
- **2026-01-17** `da09bf6f14b1` — 1 info
  - endpoint added
- **2024-05-21** `ad91eadfd8ee` — 1 breaking
  - api path removed without deprecation

---

[Operation](https://skmtc.dev/usesend/apis/usesend-api/docs/v1/contactBooks/:contactBookId/get.md) · [API](https://skmtc.dev/usesend/apis/usesend-api.md) · [Page](https://skmtc.dev/usesend/apis/usesend-api/changes/v1/contactBooks/:contactBookId/get)