The cap refers to the 12% commission Order Legend earns on sales generated through the app. You are not pre-charged this amount, Order Legend works on a no sale, no charge basis.
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Please Note: Once the cap is reached your products will no longer be advertised in Google until the next 30 day billing cycle begins. However you can increase your billing cap at any time to continue activity. The billing cap is set in USD inline with Shopify’s accounting preferences.