Are you a merchant that wants to accept payments through an e-commerce website? Do you create websites as a software developer and want to offer the best e-commerce solution to your customers? Do you represent a large software company, developing products for POS-platforms and online marketplaces? If the answer to either of these questions is positive, then you have to face the problem of payment gateway integration with an e-commerce web-site. In each of the listed cases the problem involves technical and business sides to be considered. Business side concerns the terms of your business partnership with the payment gateway. Technical side concerns the particular functions you need to implement within the payment processing solution, integrated with your e-commerce website.
A more detailed description of both business and technical aspects of payment gateway integration for e-commerce websites can be found in the respective article on Paylosophy.