Retrieve tasks

Every ID should come from a submission API's task response, not from a track result. For single-task retrieval, statuses, and callback rules, see Retrieve a task.

When the request succeeds, data is a list of task results, and each item's status is the status of that task. The returned order is not guaranteed to match the order of ids in the request. When a response item contains task_id, use that field to associate it with the original task instead of matching by array position.