DPS PX Fusion
PxFusion is a product that allows merchants to accept credit card details within a form on their own web page. The form posts sensitive data directly to DPS. DPS will process the transaction and cause the user's browser to return to the merchant website in a way that is totally transparent to the cardholder.
In other words, the request for credit card details stays on your checkout page, so the client never leaves your site.
DPS PX Pay
PxPay allows merchants to send transactions to Payment Express® via HTTPS posts to https://sec.paymentexpress.com/pxpay/pxaccess.aspx. Payment Express® responds with a unique URL for an SSL secure payments page at which the user will be prompted to enter their credit card details and complete the transaction. The result is displayed and the user is automatically directed back to the merchant's website. The result and other transaction details can then be extracted by the merchant. PX Pay is platform independent as transaction requests and responses are made using XML which can be generated and read in any programming language.
In other words, clients gets sent to a secure Payment Express/DPS page where they input their credit card details. The page is directed away from your website. Once the client is done, the page directs back to your website.