Sometimes we may ask a reviewer for proof of purchase. This involves a reviewer uploading files and other relevant documents such as invoices or receipts.
Reviewers are able to upload proof of purchase themselves (optional) or we may request (at our discretion) that they upload a proof of purchase document.
Once we've reviewed someone's proof of purchase, we will either publish the review with a 'Verified' tag or ask the reviewer to provide another proof of purchase.