We offer our clients 30 days guarantee, so you will get paid after your review survive 30 days
Survive? Does it means that the reviews could vanish depending on what it's like in the platform that we review?
However as others mentioned it would be helpful to clarify the rate per review and whether you're open to using escrow to ensure transparency for both sides.
This OP.
This is for the peace of mind of the reviewers and for you as well to make sure that the reviews will be genuine and not just made up and shortcut since it will take 30 days before the payment.