> Tychron Atlas API & Provisioning Reference — chapter 35 of 35 as Markdown. Web version: https://docs.tychron.com/api-reference/changelog/
> Source: https://docs.tychron.com/api-reference/ · Updated 2026-08-12 · Generated from the Atlas OpenAPI spec (https://api.atlas.tychron.online/api/v1/openapi is the live contract; this file is a dated snapshot of it).
> Source revision: atlas_api_reference_2026-08-12.md · sha256 482ebd3b014af053 · sanitize gate v1 clean · reconciled with OpenAPI 2026.8.25-p01 (spec sha256 cc049ef38c71cd6e) on 2026-09-05 · content last modified 2026-09-09 · newer definition under review since 2026-09-09 (not yet reconciled)
> Scope: the Atlas platform API only. The SMS, MMS, CNAM, LRN and MCL services are separate APIs with their own specifications: https://docs.tychron.com/openapi/
> Machine index: https://docs.tychron.com/llms.txt

# Changelog

## 2026-07-29

* Stubbed Section on `Roles`, additional developer commentary may be necessary to express full extent.
* Added Secret Key section
* Updated Switches to include Secret Key related changes (though this is just a side-effect of regenerating documentation naturally from the openapi)

## 2026-07-06

* Added initial Request Document APIs
* Added `enhanced_country_code` and `lrn_activated_at` to Bulk Dip Task payload

## 2026-05-20

* Added `NEW_NUMBERS` request type
* Added Inventory section

## 2025-09-21

* Added Campaign Optout Items section (read-only at this time)
* Added Optout Item Event Subscription Events
  * For DID level Optout Items
  * For Campaign level Optout items

## 2025-04-15

* Added missing fields for the System Event Provision Record Association (as a part of the visibilty changes)
  * `status`
  * `error_code`
* Added additional documentation on Provision Record statuses and Error Codes

## 2024-10-22

* Added Messaging Auto Response section

## 2024-10-04

* Added `CSP_CAMPAIGN_REGISTERED` event

## 2023-05-23

* Refactored [Cart Requests](https://docs.tychron.com/api-reference/cart-requests/#cart-requests) and [Requests](https://docs.tychron.com/api-reference/requests/#requests) to match type names
* Added CSP Enums section

## 2023-05-08

* Added section on Event Subscriptions and their events
* Added section on DID Destinations proper

## 2023-01-26

* Add missing section on `REMOVE_NUMBERS`
* Changed fonts for readability

## 2023-01-02

* Add Unshare route for CSP Campaigns `DELETE /api/v1/campaigns/{campaign_id}/shared_resource_group`
* Add Shared Resource Group route for CSP Campaigns `GET /api/v1/campaigns/{campaign_id}/shared_resource_group`

## 2022-12-16

* Dropped revision numbers in favour of dates for versioning
* Added Sections on DID / Number Optout Items

## 2022-10-18

* Use openapi spec to generate request/response models
* Add Bulk Dip Task section

## 2022-02-24

* Document overhaul

## 2022-02-18

* Added sections on registering and unregistering TCR Brands and Campaigns

## 2021-12-31

* Refreshed structure of document
* Added section on resources (will expand as needed later)

## 2021-08-24

* Added section on binding numbers to campaign via ADD_CAMPAIGN_NUMBERS

## 2021-08-18

* Fixed table formatting
* Increased document margins with table formatting fixed

## Pre 2021-08-18

* Added section on MMS enablement for existing numbers
* Added section on Authorization
* Added section on access denied codes
* First revision containing basic information on provisioning numbers

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Previous chapter: https://docs.tychron.com/api-reference/end-notes.md  
Complete reference in one file: https://docs.tychron.com/llms-full.txt