Increments the not_helpful attribute of the review by 1.
It is your responsibility to restrict users of your website from sending multiple requests for the same review.
|trkref||your organisation’s identifier|
|review_id||id of the review|
By HTTP status:
- 202 Accepted - action was successful and will be processed asynchronously
- 404 Not Found - review with given ID does no exist or you are not authorised to access it