E-Commerce Solution & Integration into the Sub-Dom

Hi, We have a project which is not very difficult, but that is need to be understood very clearly, so please read very carefully and feel free to ask any questions if there is any point that is not understood. We have a blog using wordpress, and we want to integrate an e-commerce solution to its sub-domain to sell digital product. The illustration is done in this address: www.autocad-dersleri.com. This is the main domain in which wordpress is used. To sell any product, we simply plan to put links in the posts, and lead the customer to the payment section which is put in the sub-domain. In order to illustrate this you can click the link “tıklayın…” in the first post of the site. This leads the customer to the payment section. We want this part is to be managed by oscommerce or goldcart or any other opensource payment solution which has a digital product delivery module in itself. It can be a modification of the free wordpress e-commerce plug-in also. But the point is, we don’t want the customer to register for membership, we don’t want fancy shopping cart design etc.. etc.. Just in two simple pages all the transaction should be done. So we need the oscommerce (or goldcart, or wordpress, or whatever) needs to be modified to do this type of job (as in the example: http://odeme.autocad-dersleri.com) For clearity, repating, we don’t want the customers to register, and we don’t want the classic shopping cart look. Only the 2 pages in the example should be enough to manage the taking payment and delivering the digital product. (downloadable products will be sold only) We think first the oscommerce or goldcart or wordpress’ e-commerce plug-in to be modified to this type of a job. But any other simple solution is welcomed also. We prefer the already made e-commerce solutions to be modified so that the programmer doesn’t have to write the dashboard and all the “product adding, product managing” thinks from scratch. But as I said, all solutions and recommendations are welcomed also. As an addition I want to clearify that the programmer for this solution will be appraised as a valuable technical adviser and solution provider for our groving information products company and A LOT of projects similar like this will be offered to the same person. Both ours and our friends’ projects. Thanks for taking your time and reading our job posting :) Feel free to ask your questions in the comments section of the site I mentioned above if you have any, and they all’ll be welcomed. (Have a GREAT 2012, still new year, hah :) ) and see you.