This service is used by the e-Forms Renderer to access information about form templates and also to upload/download data that cannot be sent/received via FormsHub's signalR connection due to limited message size (signalR is designed for efficiency and speed), i.e. file attachments, printed PDF files, form states (generated by changes in the form that are initiated by form/controls' events).
The service is exposed via WCF and REST interface.
Endpoint: /DesignService.svc
Security: Transport
Endpoint: /DesignService.svc/rest
Security: Transport