Got $188 Cash Back for Return MEL-BJS through Book China Online

My husband and I have been planning to go to China for the last couple of years and it's finally happening next month after we got our visas. I was looking for cheap flights through the known travel sites but Book China Online caught my eye. They are offering $188 cash back for return business class air tickets from Australia to China and other destinations. The tickets will only be $3620.61 instead of $3808.61. We need to fly business class because of my back condition and I need to have the option to lie down instead of the numerous hours spent crammed into a tiny space in coach. This applies to any airline for any Business Class seat coming from Australia. We now have our tickets and are quite excited to get to China.