Ad Prices are related to your AdSpecs and assign them to a rate card, with a certain price, billing category, and currency. Here you store all pricing information. You are able to sell an ad spec in different rate cards, billing categories, or for many different prices. If you are familiar with the standard Salesforce Opportunity process their Opportunity line item, Pricebook, and Product concept is similar.
Navigate to the App Manager and open Ad Prices. Click on New or Edit an existing Ad Price. Alternatively use the Overview Tab or the related list of an AdSpec as prices are listed in the related list Ad Prices under the ad spec's detail section.
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You can create multiple ad prices for your ad spec. For example, you can create a CPM price both for US Dollar and Euro. Or create multiple ad prices for different rate criteria.
To create AdPrices for Packages read more here: 3.6 Packages
Set the field Unit which is a 7.2.1.2 Edit Picklist Values Sets (Global Picklists) to have the calculation for Publisher Payout and Commitments accumulate the correct amounts from your sold products.
If you are using Print and Commitment Condition "rebate in kind quantity" please also set the field ADendio__PageEquivalency__c in the related Object AdType.