Represents the goal towards which the bidding strategy, of an app campaign, should optimize for.
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                Not specified. | 
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                Represents value unknown in this version of the API. | 
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                The bidding strategy of the app campaign should aim to maximize installation of the app. | 
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                The bidding strategy of the app campaign should aim to maximize the selected in-app conversions' volume. | 
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                The bidding strategy of the app campaign should aim to maximize all conversions' value, that is, install and selected in-app conversions. | 
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                The bidding strategy of the app campaign should aim to maximize just the selected in-app conversion's volume, while achieving or exceeding target cost per in-app conversion. | 
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                The bidding strategy of the app campaign should aim to maximize all conversions' value, that is, install and selected in-app conversions while achieving or exceeding target return on advertising spend. | 
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                This bidding strategy of the app campaign should aim to maximize installation of the app without advertiser-provided target cost-per-install. | 
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                This bidding strategy of the app campaign should aim to maximize pre-registration of the app. |