Accepting credit card payments online is more difficult than it seems it should be, and matters are complicated by new and evolving systems that not only combine previously distinct aspects but also are redefining the payment process and creating entirely new options. We'll attempt to explain what is needed and why.
Please note that in this discussion we will not cover things like mobile payments, peer-to-peer payments, or “marketplace” systems. While they can be extremely beneficial in certain circumstances, they are worth exploring in depth if your e-commerce journey requires them.
In order to accept credit card payments online, a merchant typically needs all of the following:
For what it's worth, for merchants based in the US we have worked with a trusted partner to develop two merchant + gateway options. See our website for more details. For a full list of our supported gateways, see our gateways page, or contact us for if you have any questions.
In some systems you can get two or three of the above functionalities combined. We'll focus on services that combine the payment elements first:
Worth noting is that there are many ecommerce platforms that offer their own merchant account and gateway services. In the vast majority of cases these providers are simply white-labeling another company's services. There's nothing wrong with this, but you're unlikely to get any sort of competitive pricing with this situation.
An important but often misunderstood piece of credit card processing is the relationship between “authorization” and “capture”. The easiest way to explain it is by using a gas station as an example. You drive up to the pump and insert your credit card, at which point the card is “authorized” for (let's say) $75. This authorization checks with your bank to make sure you have the funds, just like a normal transaction, but doesn't yet charge the card (“capture the funds”), since the final dollar amount is unknown. Once you have finished pumping and the final transaction amount is known (say, $45.03), the system issues a “capture” for $45.03. The first part is an “authorization only”, or “auth-only”, transaction. The second part is the capture.
(Another option would be for the gas station to authorize a small amount like $1 just to make sure that it's a valid card, then upon completion clear that auth and issue an auth+capture for the full amount in one go.)
The other, much more common way to process transactions is to do the authorization and capture at the same time, referred to as an “auth/capture” or “auth/capture”. Imagine buying groceries: You go to checkout, the total charge is determined, and your card is charged (both auth'd and captured at the same time).
Where things get confusing is on the proper usages of an auth-only transaction. It is often thought of as a way to accept pre-orders or to handle trial billing periods. While you could use an auth-only to handle these types of charges, it might not be a great idea for a few reasons.
A better use of auth-only transactions would be to handle expected variations in product delivery or final charges. For example, if your shipping charges vary by factors that FoxyCart cannot account for, or products may not be available regularly, you may want to auth-only then adjust the final transaction amount before capturing the funds. Important to note, however, is that you can never capture more than you've initially authorized when using a traditional gateway. Some gateways allow you to capture only as much as has been authorized, while others 1) may allow you to capture up to a certain percentage of the authorized amount, but not more than a certain dollar amount higher.
In most situations we strongly recommend doing an auth+capture. If you do have specific requirements that necessitate auth-only processing we encourage you to test thoroughly and keep up to date on any changes your gateway may make that impact that functionality.
So what gateways are supported by FoxyCart? See the complete list.