If you're trying to make money from your beats then keep them off of YouTube, because it's an entertainment platform and not a business platform. Purchases are not made via YouTube; therefore, it doesn't make since to use it for business transactions. Instead, fir the best results, use YouTube to entertain people: music videos, comedy, tutorials, etc.
If you're goal is to sell beat downloads, use a music player that handles money transactions via paypal. Create a website, if you don't have one already, and embed the music player on it. Once you have your website, funnel traffic from YouTube to the beat store. Needless to state, your YouTube content would need to be catered to beat buys. There are tons of ways to do that, all you need to do is be reach the right people at the right time, easy enough right? You know how to reach me, so get at me if you need ideas.