Yes, Site Store Pro uses an Open API architecture that allows for the addition of custom payment gateways. SiteStorePro.com provides integration assistance to get a non-supported (custom) gateway to work with the Site Store Pro checkout process. However, If you would like Site Store Pro to add and test a custom gateway, we charge $75/hour. Typically integration time for custom gateways is 1-3 hours. Furthermore, if for any reason, the custom gateway will not work with Site Store Pro, we will refund 100% of the integration fees.