Whatever your level of technological savvy, you will need to read about the various options. Some will work better in your specific circumstances, and you can research those reasons in a good Internet search-and-study session. If you have already signed on with a processing firm, you can avail yourself of their tech support expertise and discuss your gateway issues with someone more knowledgeable. Whatever you do, do not proceed past a point of confusion – it won't get any clearer or simpler down the line, so make sure you understand the basics, at the very least.
If you have already set up your e-commerce website, with a shopping cart or checkout system, you need only mention this to your processor's customer service representative. The majority of shopping cart installations are compatible with the major players in the payment gateway product industry. Even if you built your own shopping cart and database systems, your technical support person (or the processor's) can study the documentation for the gateway you wish to use and most likely find a way to make them work together for you.
Fortunately, most of the major online payment gateways are available from most processing companies. You can learn about all of your options by researching “payment gateway software” on your favorite search engine.
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