I have a client who says they redeemed a promo code but they are not seeing the discount. How is that handled?

Have your client call Rover Customer Support. The number is [Edit: Rover’s contact options have changed. Visit the Rover Help Center at https://support.rover.com/ to find the phone number, help articles, or chat with the team]. There's no need for you to get involved, and there's nothing you can do.