Definition of 

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What's 
Up to 18 Characters
: it is one of the possible values for
Customer Price
. It means:
The price per unit billed to the customer, which you set for your app or in-app purchase in App Store Connect. *The customer price is inclusive of any applicable taxes we collect and remit per Schedule 2 of the Paid Apps Agreement. Negative values indicate refunds or CMB credits for previously purchased apps when the CMB column shows "CMB-C’".

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App Store Connect

The (only) data hub made for apps