Typically, gift cards are supported via an integration with your POS or merchant account. Even if you originally added gift cards via your merchant account provider (or POS with built-in processing), there is a chance the actual gift cards are subcontracted through a third-party vendor. You’ll need to inquire with your current processor to find out exactly what network your gift cards operate on. Popular gift card providers include Customer Connect and National Gift Cards.
Most payment gateways—such as First Data and Worldpay—have their own internal gift card processing solution. So, whether or not you can use your current gift cards when you switch processors will depend entirely on what network your new processor and old processor used. If they operate on the same network, then you can likely keep your current gift cards.