Will you still get paid if you don't send a rover card/track a walk through the app?

Of course you will be paid for your services, however you may need to contact Rover support so they can mark the walks completed. If you don't see the funds transfer to your account in a few days I would give them a call [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]