What kind of prepaid card are you talking about? A prepaid Visa or a XboxLive card? If it’s the latter just go into your account management and input the code on the card that will load your account with the $50 credit and then purchase the DLC through the app store.
If it’s a Visa type you do have online options but it will depend on what kind of card, where it came from, etc. I get different types of Visa gift cards as rewards from work all the time so I have a bit of experience making online purchases with them. Some work fine online once you register it through the bank’s website that issued the card(this will be on the back of the gift card). When purchasing something online with a prepaid card, the card needs to have an address associated with it which is why you need to go through the issuing bank to register the card. Some cards will give you fits though, the ones that come to mind specifically are the Visas from Walmart. There seems to be some delay in the registration process that can take several days to activate for online use. I have run into hiccups where no matter what I did the website I was purchasing from just wouldn’t take the card, however using the card through Paypal has never failed me so if the website I’m purchasing from has a Paypal option that’s the route I always choose.
What I would do if it is a Visa and you are wanting to put that $50 into your Xbox Live account is first register the card with the issuing bank listed on the back of the card. Then head over to Paypal and add that card as a payment option. Once that’s done go to gametimezone.com and purchase a $50 Xbox Live Digital Gift Card and they will email you the code. Then input that code into your Xbox Live account.
Or if you aren’t in a hurry for it tonight, do like Sat said and stop by Wal-Mart, BestBuy, Gamestop, Target, etc and pick one up. They are sold in tons of places, even the truck stop near me has them for sale.
Does the US$50.00 DLC Car Pass includes the 2011 Bugatti Veyron 16.4 Super Sport and the 1991 Mazda #55 Team MAZDASPEED 787B? How or where do I get these in FM5?
The Mazda 787B and Bugatti Veyron are part of the VIP pack, and the VIP pack is not included with the Car Pass so it would be an extra cost to add them to the game. See this thread for overviews of the Car Pass and VIP packs: http://forums.forza.net/turn10_postsm15096_FM5-Cars-and-DLC-list.aspx
Note that other than a few gift cars, purchasing the Car Pass or VIP will not put those cars in your game garage - they are added to the Buy and Rent car rosters and you’ll need to then buy the cars with credits or tokens to use them in Career.