You don't need any cable or digital subscriptions at all - it is a one-time payment to watch the fight. Payment is made with CC, PayPal or through iTunes / Google Play or Amazon. Your purchase will include the show with both English and Spanish commentary options , 1080p or 720p HD + SD and a replay available until 11:59pm EDT on the 20th of September.
The show will be linked to your account and you can watch on any device with FITE installed if you are logged in. (only one device can stream at a time)