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Using the PayPal “Buy Now” feature, your customers will be immediately able to purchase a single product direct from your website. Once your customer has selected “Buy Now” (either via a link or a button on your web page), your O4W stored procedure will use the O4WPayPal call to redirect the browser to PayPal’s on-line payment site, from where your customer’s transaction can be completed.
Using the PayPal “Add to Cart” feature, your customers will be able to purchase one or more products by adding them into their PayPal shopping cart through your site. Once your customer has selected a product to “Add To Cart” (either via a link or a button on your web page), your O4W stored procedure will use the O4WPayPal call to redirect the browser to PayPal’s online payment site. From there, your customers can review their shopping cart and then they can choose to return to your site to browse or add additional items to their shopping cart, or they can proceed to “Checkout” on the PayPal site to complete their transaction.
Using the PayPal “Add To Cart” feature, your customers will be able to review which products they have placed in their PayPal Shopping Cart, modify their selections or begin the PayPal Checkout process.
Martyn's RevSoft UK Blog 