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• If the highest price of the product (max price in the rates table) is less than the threshold, no charge is applied.
• If the threshold is less than the highest price of the product, charge is applied.
• If no amount is set, the charge will applyis applied.

When you have saved the basic parameters, you need to set charge amounts in the screen below. For each tariff, you can define an amount or a rate, and, optionally, a floor and a ceiling that the customer will pay. Rounding parameters enable you to invoice the customer consistent amounts according to your business policy.

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Next Step: associate the charge table to relevant product(s), as you can see examples here for competitions/events or here for packages.