<p>Starts a state machine execution. If the given state machine Amazon Resource Name (ARN) is a qualified state machine ARN, it will fail with ValidationException.</p> <p>A qualified state machine ARN refers to a <i>Distributed Map state</i> defined within a state machine. For example, the qualified state machine ARN <code>arn:partition:states:region:account-id:stateMachine:stateMachineName/mapStateLabel</code> refers to a <i>Distributed Map state</i> with a label <code>mapStateLabel</code> in the state machine named <code>stateMachineName</code>.</p> <note> <p> <code>StartExecution</code> is idempotent for <code>STANDARD</code> workflows. For a <code>STANDARD</code> workflow, if <code>StartExecution</code> is called with the same name and input as a running execution, the call will succeed and return the same response as the original request. If the execution is closed or if the input is different, it will return a <code>400 ExecutionAlreadyExists</code> error. Names can be reused after 90 days. </p> <p> <code>StartExecution</code> is not idempotent for <code>EXPRESS</code> workflows. </p> </note>

{
  "success": true,
  "data": {
    "id": "abc123",
    "created_at": "2025-01-01T00:00:00Z"
  }
}

{
  "success": false,
  "error": {
    "code": "VALIDATION_ERROR",
    "message": "Invalid request parameters"
  }
}