e-commerce
Making Money with Your Drupal Website

Let's be honest for a minute. As much as the Internet marketing industry talks about building community and participating in the conversation, most of us are in the game for one reason, and one reason only. We want to make money.
There are the select few who don't care about making money, and are truly happy with trying to change the world. But for 90% of us, that just isn't the case.
How to keep osCommerce Session ID's on non-store pages.
Instead of using the standard link convetion: <a href="new-page.php">
Use the following format: <a href="<?=tep_href_link('new-page.php')?>">
If you really want to get creative and are looking at SEO specifically you can create custom pages for each product category by copying the index.php page and saving it as new-category-specific-index.php page. This page will function just like the default index.php page in osCommerce, to have the page return only the specific category you need, you'll need to use the following code:
<a href="<?=tep_href_link('new-category-specific-index.php','cPath=28')?>">
Remember to change the cPath=28 to the actual desired category or you'll get all the products.
Merchant account
Merchant accounts and processing gateways are Internet services that enable online processing of credit cards. Online merchant accounts are variations of the traditional credit card processing used by retail stores and phone order houses. A business must qualify for merchant account; each provider has a different set of requirements.
Processing gateways are an intermediary to get card information from your shopping cart to the merchant account. Often processing gateways are packaged with merchant accounts.
Merchant Account Tips
Shopping cart
A shopping cart is an e-commerce web application that mimics a virtual store. It allows customers to browse and select a product(s), then purchase them at a virtual check out.
Most e-commerce is done with one of the many preprogrammed shopping carts that are available. While these packages should prove adequate for most e-commerce needs, custom programming is always an option for more advanced features.