I am interested in getting reviews done as well verified ones that stay there not gone the next day.
If you offer coupons or incentives with your order (leave us a review and get a gift card or refund) it only takes one customer to complain and you are banned. Worse a lot of competitors will buy your product for research and to get amazon to say customers who bought your item also bought theirs. They will tell on you in a heartbeat.
As for the advice of not actually shipping anything. Amazon catches that. When a review is written amazon will track the shipment to see if the review is legitimate. If you use a gift card or even a real gift card the review will disappear. If you only write a verified review on a product and non verified on others it will disappear.
There is really only one legitimate way to do it.
Find people who are willing to buy your product for reviews ahead of time.
We have a network of around 400 verified USA reviewers who get paid when they buy our products and 25 when they write a review. So they use real personal CC numbers, have established amazon accounts. It costs us around $5000 bucks to get a product to have 400 good reviews. We do them drip by drip. Also increases rank.
You can try the guys Buy Amazon Reviews and get your listings flagged so all future reviews will get monitored. Or you can do the hard work to build up your own personal network.
We are in the health category. If someone is in a different category we are open to joining forces. Mainly so that week keep our reviewers happy with more income and more giveaway products.