Adding a payment to access members area for online training. This will allow me to upload videos that are accessible for 24 hours for monthly challenges. Challenges last 28 days and Participants can register through paying £28 per challenge with a refund of £8 upon completion of the challenge, as long as the website records that participant taking part for the whole session for the full 28 days – this should activate a refund of the £8. Is it possible in Wix via code ??