An optimization period for Push Notification campaigns (based on the CPC pricing model) is a feature the main goal of each is to improve traffic distribution, helping well-performing campaigns get more quality traffic. We also strive to protect our network from fraudulent traffic manipulations. 

When you start your CPC Push Notification campaign, each new creative undergoes a short optimization period. During this period, your creative receives our top-converting traffic and is expected to show the highest possible CTR.  
While the optimization is in progress, you will be charged for the traffic by CPM, but once it’s over, your campaign will switch back to CPC. You will see the disclaimer about the additional charges during the campaign creation.

If your creative performs well and receives clicks during the optimization period, their price will be deducted from the optimization costs, making the optimization price lower, too. If the cost of all received clicks exceeds the optimization budget, the optimization will be free for your creative.
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Please note: When you set up a campaign, you see the highest possible price for optimizing 1 creative based on the GEO and User Activity targeting you have chosen. The final price of optimization will probably be lower.

The traffic cost used for optimization will appear in your statistics shortly. The result can be found in the creatives section inside the campaign's statistics.
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