Perform a backfill if you notice inaccuracies in the rc_ custom properties. This process ensures that all Recharge customer data is passed to Klaviyo from Recharge successfully. 

To backfill your historical data: 

1. Select Backfill historical data from the Klaviyo integration page in Recharge.
   
2. A command box will appear explaining the Backfill process. Select Proceed to backfill your historical data.
3. Monitor the Backfill status listed under the Backfill historical data section of the Klaviyo integration in your Recharge admin. Use the Refresh status option to get an updated status of the backfill. 
4. The Backfill status will display as completed once the backfill has finished. You will then be able to see customer properties listed for existing customers.

Issuing a backfill will not delete any properties, it only adds properties on existing subscriptions customer profiles. Any other properties will be unaffected.