I've implemented a Bitcoin system with the help of block.io on my marketplace for Nootropics, NootropicPlace.com.

Was able to set it up, relatively easily, so that everyone who registers is generated their own store Bitcoin address. Funds can be sent to this Bitcoin address to fund their wallet. Also, orders can be placed, and withdraws made from their wallet and its all done automatically!

After seeing how wonderful a system Bitcoin is, I am a true believer. What an amazing technology!