Customer reviews by Trusted Shops (Trustedshops.de):

Every consumer review is checked for authenticity before publication, ensuring that reviews only come from consumers who have actually purchased/used the reviewed products.

The verification is carried out by sending individualized links to consumers after completing an online order, which lead to an online review form and ensure that access to the review function is only granted to consumers who have actually purchased a product.

Customer reviews by Judge.me:

The reviews are not checked for authenticity before publication. They may therefore also come from consumers who have not actually purchased/used the reviewed products.