On the basic level, white-label payment gateway concept denotes an opportunity of an ISO or acquirer to provide payment gateway services under its own name (or brand). Some companies only need to put their logo on the payment gateway software product and leave the actual payment gateway services to third parties. Others need more customizable solutions and greater control of payment processing. Depending on your particular needs as an ISO, you can choose either a traditional payment gateway offering or the most suitable “flavor” of white-label solution, such as classical white-label payment gateway, a dedicated gateway instance, a virtual gateway solution, or a licensed product. All the flavors have their own advantages and disadvantages, related to customization limitations, price, PCI compliance, and other aspects.
If you need more information to choose the right white-label payment gateway flavor for your business, read the respective article on Paylosophy.