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The detailed sub total (quantities, prices, costs, insurances, etc.) must be stated before final confirmation of the order.
Makes it possible for the user to know the total sum of the order.
remove anything that might delay the order.
State the detailed sub total of the product(s) or service(s) that are being ordered on the recapitulating order form before confirmation.
Make a test order and check that all information is present prior to confirmation.