Premium applications are classified as premium due to one or more of the following reasons or similar
Complex in product engineering - e.g. expert integration skills
Complex in deployment - e.g. it requires more cloud resources
Compex requirement from the application - e.g. application requires several integration requirements
Cross-charging by application - e.g. Xero charges Form Director for every active connection.
Premium applications are available only to subscribers of the Premium or above plan. Sample Premium applications consist of Xero and a few database applications.