it worked with below "sourceType": "EXPRESSION",          "source": "{{now()}}",          "destination": "_XXXXX.systemTime"      } Thanks for your inputs

I am trying to set current date in mapping set and using API to set this. foundation/conversion/mappingSets

Unified Identity Store 

Yes

Out of the box job runs every day to stitch Identities.."You can use Identity Service to link identities and piece together a complete picture of your customer that might otherwise be scattered across different systems." Identity Service Overview | Adobe Experience Platform

Identity Service Flow Run Delay 'Datalake_to_UIS_Flow' has been processing for more than expected time. What are the factors effecting this processing time? Any help would be greatly appreciated.

Thanks for the response @brekrut We currently update profile data through a daily ingestion job, which runs only once a day. However, we’ve noticed that batches for the profile export for destination -Merge Policy -xxx dataset are being ingested approximately every 10 minutes. I’m trying to better u...

Thanks David & Pratheep for the response If we have default merge policy, Both datasets all attributes values data should match Right ?        

What is the importance of the profile_export_for_destination_merge_policy__XXX dataset in AEP?  How different is it from Profile_Snapshot__XX?

Tried, not working