You can customise your own Product Review action with a Custom Action or a Submit URL Action.

Custom Action Method

1. Create a campaign
2. Create a Custom Action in the How to Enter/Redeem tab
3. Create a button in the description area and enter the link to your product review form
4. You can manually verify the entry by asking for the user's email address or any other identifying information
5. You can also set up Custom Action Tracking to automatically verify the product reviews

Submit URL Method

1. Create a campaign
2. Create a Submit URL Action in the How to Enter/Redeem tab
3. Create a button in the description area and enter the link to your product review form
4. Set a domain restriction to your product review platform to minimise irrelevant submissions
5. You can manually verify the entry by visiting the user's submitted URL