Hi Carla, please find the instructions below to calculate the transaction see and apply a discount based on coupon code (question from your other post). Transaction fee Currently we do not have the option to charge a different transaction fee depending on the payment method. For now, you can set up a fixed percentage to be charged as a transaction fee. Login to Neartail > click on the form to open it > Edit page will be displayed > In the Neartail Edit page, click on the Add price field icon > select Tip, click Next > Update the title "Transaction fee", select Percentage option, click Next > Enter the percentage for order amount and click Create. For example, you can charge 5% of the order amount as the transaction fee. Discounts You can apply a discount based on the answer (coupon code) entered by the user for the short answer question (Apply coupon code). Please note that any user who enters the correct code will get a discount. Add coupon code option (You can skip this if you have already added this) In the Neartail Edit page, click on the Add field icon > enter the title "Coupon Code", select Short answer question Calculate discount In the Neartail Edit page, click on the Add price field icon > select Discount and click Next > select Custom formula and click Next > enter the below formula and click Create. IFS(Coupon Code == "LOYAL15", 0.15 * Order Amount, 0) Note: Coupon codes are case sensitive. You can change the coupon code and discount percentage as required. You can also add multiple coupon codes or provide fixed discounts. IFS(Coupon Code == "LOYAL15", 0.15 * Order Amount, Coupon Code == "WELCOME10", 10,0) Calculate total amount including transaction fee minus discount In the Neartail Edit page, click on the Add price field icon > select Net amount, click Next > select Standard calculation using NETTOTAL() formula, click Next > click Create. Please try this confirm.