To enable a user to develop add-ons using the SDK and API, navigate to the System Admin panel and open the Accounts tab. Find the relevant account by entering the email address of the user under Manage Account and click Enable developer.
In the appeared window users can choose to Enable or Disable developer for the selected user.
Once the user is enrolled as a developer, the Developer tab becomes available under the Account Settings for the user.
Once the user has completed the set-up of the SDK development environment, they can start with the development of an add-on for the integrated Marketplace.