Do you mean buy a Bluray or DVD? I'm a little confused on what you want to do. My Fandango account is connected to DMR but all that does is give you Disney Movie Rewards points when you pay for a Disney movie (in the theater) through Fandango. It's not credit to buy a movie. I just did it through the app on my phone.
http://fandango1.custhelp.com/app/a...rewards-credit-for-purchases-made-on-fandango
Okay looking further it looks like you can purchase movies with Fandango Rewards but it's not connected to Disney Movies Anywhere. So you can connect Fandango VIP to Disney Movie Rewards but it doesn't look like you can connect Fandango Now to Disney Movies Anywhere. When looking at my DMA app there's no selection for Fandango Now so if you buy a Disney movie from them you won't get the points as far as I can tell.
Fandango VIP + Disney Movie Rewards = DMR points when you go to the theater and see a Disney Movie
Fandango Now does not connect to either so no points and a Disney movie purchased through them wouldn't go into your DMA account. Disney is not UV so I'm thinking that movie would only be in Fandango Now.