About the gateway entry and end point
Entry point
Gateway communicates with other applications using the VM Connector. Adding an entry point to the application allows the gateway to start the required integration process.
End point
If the integration process is triggered by a Collibra DGC workflow, you may want to send the result back to the workflow instance or close the Collibra DGC session. This would prevent the session from being left open after the integration process has ended.
Each of those steps may be performed manually in any part of the flow, see Sending information to the workflow, but the gateway handles it automatically.
The gateway sends all text properties that are contained in the "payload" to the Collibra DGC workflow instance and closes the session. Those properties can be accessed later as variables of a given workflow process instance.
The gateway sends the response back to the workflow only if the dgcWorkflowProcessInstanceId and dgcWorkflowMessageEventName properties were sent during the start of the integration process. See Connecting to the gateway from a workflow for more details.