Mals Ecommerce Project for Small Online Webstore

Hello, I have a small webstore that runs on mals ecommerce. www.mals-e.com. I sell t-shirts and have several things I would like to do with my store. I have a premium mals ecommerce account so a lot of flexibility is available. These are the things I would like to accomplish. 1. I would like to update my checkout page to be consistent with my current webpage. The style and design will need to look like my current website. 2. Have a way to track inventory when someone buys something from my website. When someone clicks checks out, I need a remote-call to be sent to update a database of some sort. You can decide what you think is the best way to do it and I can pay you to do that. I would be more than happy to provide the website in questions. The website is in very good shape and everything works but I would like to add these few extras to make the buying experience better. Thank you! Please message me for website and questions.