Misuse of ratings, feedback, or reviews: Any attempt to manipulate ratings, feedback, or reviews is prohibited.
Reviews: Reviews are important to the Amazon Marketplace, providing a forum for feedback about product and service details and reviewers' experiences with products and services — positive or negative. You may not write reviews for products or services that you have a financial interest in, including reviews for products or services that you or your competitors sell. Additionally, you may not provide compensation for a review other than a free copy of the product. If you offer a free product, it must be clear that you are soliciting an unbiased review. The free product must be provided in advance. No refunds are permitted after the review is written. You may not intentionally manipulate your products' rankings, including by offering an excessive number of free or discounted products, in exchange for a review. Review solicitations that ask for only positive reviews or that offer compensation are prohibited. You may not ask buyers to remove negative reviews.