Feedback on delivered tasks completed incorrectly can be provided by rejecting tasks with a request to the API.

A task may be rejected via the API with a request to a unique URL using the projectId, taskId and access_key. To help our Delivery Centers make appropriate corrections, rejection requests must also include a rejection reason or reasons in the body.

You may choose to provide either a single reason or an array of reasons. For giving feedback on a complex annotation task we suggest the following format:

[
  {"Metadata Errors": []}, 
  {
    "Object_Errors": [
      {
        "ObjectID": 3, 
        "Frame": 0, 
        "Error Tag": "Object Missed", 
        "Error": "Please annotate all objects in the field of view"
      }, 
      {err2}...
    ]
  }
]

Optional ordinal field in your request may give the step number you are rejecting back to, if your project is a multi-step project. Please check with your project manager about step numbers to use.