When we use Real Time Event and Real time Container type Campaign, within the Strategy rule associated with the Campaign, the payload (Primary.EventPayload or Primary.ContainerPayload) will contain the customerID.
But in the strategy rule if I need more customer details then I have to look into the database/DataSet against that customerID.
Now what is the way to fetch customer details against the customerID, being within Strategy rule? using DataPage in the Data import component? that is only and best way?
2. Part of the Pega Marketing / CDM setup and implementation process is to detail how the system will load data. Please see the implementation documentation. The details will be version specific so see the relevant version of the documentation, but at a high level, you setup a Customer data data-flow that defines how to load data and the system will use that once configured.