# September 2025

## [September 11, 2025] Newly Added Interfaces Related to union Margin

Changes:
1. Newly Added — Query the USDT amount required for switching from union margin to single-currency margin /api/v2/mix/account/switch-union-usdt
2. Newly Added — union Margin Conversion and Repayment API /api/v2/mix/account/union-convert
3. Newly Added — union Margin Configuration Parameter API /api/v2/mix/account/union-config
4. Newly Added — union Margin Currency Transfer Limit API /api/v2/mix/account/transfer-limits
5. Newly Added — New union margin parameters in the WS Account Channel: `unionTotalMargin` (Margin Amount), `unionAvailable` (Available Margin), `unionMm` (Maintenance Margin), `assetMode` (Account Mode)
6. Newly Added — New `assetMode` (Account Mode) parameter in the WS Position Channel

## [September 4, 2025] Notice: Adjustment to the transferId field in the sub-main account transfer records retrieval function. The transferId will be updated to the one returned during sub-main account transfers.

Interface: /api/v2/spot/account/sub-main-trans-record <br/>
Changes:
- Previous generation rule: for transferId: Auto-incrementing ID
- New generation rule: for transferId: Snowflake algorithm

## [September 2, 2025] Add reason field for Get Upgrade Status

Interface: /api/v2/spot/account/upgrade-status<br/>
Changes:
-  Add reason field for Get Upgrade Status