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JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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Original thread title: Using your payment form, can you create discount code for visitors?
You need to use Paypal under the payment tools in order to use coupon or discount codes. After putting all the products and prices, you will see a screen where you can add coupons.
Here's a guide on how to add Coupon Code in the Payment Form.
Hope this helps. Let us know if you need any help.