After an order is delivered, Tuppence asks the shopper for a review. You read each one, publish
it, and reply once. You can keep a review off the page only for a rule of your published review
policy, and the writer is told which. Being negative is never a reason.
GET and POST /v1/product_reviews/settings: whether requests go, how many days after delivery
(5 by default, 14 for health and beauty), verified buyers only, and any incentive.