Need custom development for wordpress plugin (eCommerce)

Hello,
I have a website running on the eShop wordpress plugin. I need to add a BitCoin gateway. Would anyone be willing to help out with this? The initial code is at http://quirm.net/wiki/eshop/additional-plugins-and-code-snippets/adding-a-merchant-gateway/ but I do not want to mess it up and would like someone with more experience.
Thanks

the easiest solution is to change it on woocommerce.then you can use the free bitcoin plugin for woocommerce