-**text** | **str** | Order custom information, users can use this field to set a custom ID, and the user-defined field must meet the following conditions: 1. Must start with `t-` 2. If `t-` is not calculated, the length cannot exceed 28 bytes 3. The input content can only contain numbers, letters, underscores (_), midscores (-) or dots (.) In addition to user-defined information, the following are internal reserved fields that identifies the source of the order: - web: web page - api: API call - app: mobile terminal - auto_deleveraging: Automatic position reduction - liquidation: ⽼Classic mode position forced closing - liq-xxx: a. The new classic model of forced closing positions, including position-by-position, one-way full position, and two-way full position non-held position. b. The unified account single currency margin model of forced closing positions by position - hedge-liq-xxx: New classic model two-way full position hedging part of forced closing, that is, close long and short positions at the same time - pm_liquidate: Unified account cross-currency margin model for forced closing positions - cob_margin_liquidate: Unified account combination margin model for forced closing position - scm_liquidate: Unified account single currency margin mode position forced closing - insurance: insurance | [optional]
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