What is JotForm?
JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
At JotForm, we want to make sure that you’re getting the online form builder help that you need. Our friendly customer support team is available 24/7.
We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
If you are using the Payment tools, you can easily setup coupon codes there.
You can follow the tutorial link here, https://www.jotform.com/help/233-How-To-Add-Coupon-Code-in-the-Payment-Form. And you can also use the screenshots below as a guide.
Adding coupon code in Payment Tools (Purchase Order)
1. Choose a Payment tool widget.
2. Setup the appropriate fields and continue until you reach the coupon code setup.
3. Add coupon codes and customize them.
4. In your form it will automatically display a coupon field textbox. You can also adjust this by clicking the wizard setup.
Let us know if this helps.