Amazon Mechanical Turk
Requester UI Guide (API Version 2017-01-17)

Approving and Rejecting Assignments

A Requester approves or rejects assignments that Workers submit. When you approve an assignment, the Worker gets paid; when you reject an assignment, the Worker does not get paid.

You can approve results individually or all at once. Also, you can sort the results based on the Worker ID so you can review the results from a specific Worker all at once.