Modify Order Strategy

### Modify a running Order Strategy. **Available to:** All authenticated users **Environments:** Demo, Live **[Rate Limit](/api/authentication#request-rate-limits-and-time-penalties):** 500 requests per hour, 2-second back-off, counts all requests Sends a `command` to an Order Strategy that is already running, identified by its `orderStrategyId`. Order strategies are the multi-bracket constructs created with [`startOrderStrategy`](/api/rest-api-endpoints/orders/start-order-strategy); this endpoint adjusts one of those strategies after it is live without tearing it down and rebuilding it. To stop a strategy entirely, use [`interruptOrderStrategy`](/api/rest-api-endpoints/orders/interrupt-order-strategy) instead. The request body requires `orderStrategyId` and a `command` string (up to 1024 characters) describing the change to apply. The optional `customTag50` carries a registered tag; if your account requires tag50 registration, an unregistered tag is rejected before the command runs. As with other order commands, success is not guaranteed — the underlying orders may already have filled, the strategy may have completed, or the exchange may reject the change. The endpoint returns an `OrderStrategyStatusResponse`. When the request is rejected, the response carries a `failureReason` and an `errorText` describing the problem; on success the response includes the updated `orderStrategy`. **Common Failure Scenarios** - The strategy or its orders already completed or were cancelled (`TooLate`). - Another command for the strategy is still being processed (`AnotherCommandPending`). - The user isn't permitted to trade this account (`Unauthorized`). - A required `customTag50` is missing or unregistered. **Error Messages** | `failureReason` | Trigger | |-----------------|---------| | `TooLate` | The strategy or its orders already completed or were cancelled. | | `AnotherCommandPending` | A previous command for this strategy hasn't completed. | | `Unauthorized` | The user isn't permitted to trade this account. | See the `failureReason` enum in the `OrderStrategyStatusResponse` schema for the complete list of values.