Configuring a cloud source in Scope is a two-step process.
Obtaining Proofpoint On-Demand (POD) API credentials from the Proofpoint support team. Please refer to Section 1 – Proofpoint On-Demand Setup
Setting up the Proofpoint On-Demand cloud source in the Scope application. Please refer to Section 2 – Scope Setup
Log in to the Proofpoint Email Protection Portal.
Go to Settings -> API Key Management, then click Create New.

From the ellipsis (three-dots) menu on the newly created API Key, select View Details and copy the key.
Copy the Cluster ID. This is assigned by Proofpoint and is displayed in the upper-right corner of the management interface next to the release number. Refer to Figure 5.

Note: The backfilling API requires a different set of keys than the API used to ingest Proofpoint On-Demand events. Repeat these steps to generate an additional set of keys for backfilling.
The Cluster ID and API Token are to be configured in Scope Setup: Step 1 for initiating the Proofpoint On-Demand log ingestion.
Once the credentials are generated, they must be configured in the Scope application to establish the connection and enable data ingestion from the Proofpoint On-Demand environment.
In the Scope application, to register a Proofpoint On-Demand cloud source, navigate to the cloud source registration page –
Log into the Scope application
Select the required Organization from the Organization dropdown
Navigate to the side menu -> Administration
Navigate to the Cloud sources tab
Click on the +Add Source button
In the Add Source pop-up, provide the parameters below.
Source: Select the Proofpoint OnDemand source from the Source dropdown.
Site: The user defined name for the Proofpoint On-Demand cloud source.
Cluster ID: Unique identifier assigned to a specific set of servers by Proofpoint. (from Step 1).
API Key: The generated API Key (from Step 1).
Backup Cluster ID: Unique identifier assigned to a specific set of servers by Proofpoint. (from Step 1).
API Key: The generated backup API Key (from Step 1). This API key will be used for backfilling of PoD events.
Contact Email: The email address of the person who registers the Proofpoint On-Demand cloud source in Scope.

Once the required connection parameters are entered, the Proofpoint On-Demand cloud source registration is complete in Scope and is ready for real-time ingestion of Proofpoint On-Demand logs.