Add a short answer question with number response validation in Google Forms and then add the formula in Formfacade to calculate the amount after discount. Please follow the instructions below.

IFS function evaluates multiple conditions and returns a value that corresponds to the first true condition. The syntax for the IFS function is: IFS(condition1, value1, [condition2, value2, …]) where

If the coupon code is WELCOME20, we will apply a 20% discount by multiplying the total amount by 0.80. Otherwise, zero discount i.e. amount to be paid is the total amount for the products ordered. IFS(Apply Coupon == "WELCOME20", 0.80 * Total Amount, Total Amount)

CURRENCY function displays the number in currency format. The syntax for the currency function is: CURRENCY(symbol, number) where

We will use the currency function to format the calculated total amount and display it as a currency. CURRENCY("$", IFS(Apply Coupon == "WELCOME20", 0.80 * Total Amount, Total Amount))

Instead of applying a percentage discount for the coupon code, you can offer a fixed dollar amount discounts. Let's say you want to offer a $5 discount for WELCOME20 coupon code. So, if the coupon code entered by the user is WELCOME20, we will simply subtract 5 from Total amount. CURRENCY("$", IFS(Apply Coupon == "WELCOME20", Total Amount-5, Total Amount))

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