The only optimization values we currently support setting through the Ads API are: DEFAULT, ENGAGEMENT, and WEBSITE_CONVERSIONS.
Below is information on the kind of optimization we do, by objective, depending on the optimization set at the line item.
- Awareness Objective
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DEFAULT: Optimize for maximum reach
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ENGAGEMENT: Optimize for reach with engagement
- Website Clicks Objective
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DEFAULT: Optimize for link clicks
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WEBSITE_CONVERSIONS: Optimize for conversions