I need shop/eCommerce software for just one product/ single product, I found all eCommerce software that I search always for multiple product, not for single product
Hi PayPal would be an easy solution or Google CheckOut. You can just post their "Buy Now" button code into the page where the product is and you're done. You have to set up your checking account, enter the 2 small deposits they make into your account and finish the set up process before getting the code though. Take about 3 days. I would prefer a "buy now" option rather than a "Add to Cart" option for 1 product site.
You can set this up easily in Magento. Just install Magento and then set a landing page linking to your product page. Or simply make your product page your landing page.
Rather than searching for software, you can simply get saas kind of shop to upload your single product. Just try ZSCART.. hope it works.