CPA optimization is a feature to turn off underperforming zones automatically, based on a certain set of criteria. All the optimizations are made using data within a 7-days timespan. To make it work, you need to set up S2S postback. There are two scenarios available:
Recommended. The program analyzes the conversions themselves and removes zones, which are not converting within the target value.
Custom. You specify the criteria according to which you want to remove zones.
Example 1: if during 7 days, the cost of clicks was higher than the set amount and there were no conversions, then the zone will get automatically disabled.
Example 2: If you spent a certain amount of money and the conversion cost was higher than the specified value, then the zone will also be disabled.