How can I add a coupon code to the payment form?

My payment processor is Square. I need to add a section for promo code and I can't figure it out. Please assist.

In order to add coupon codes in the payment form please follow our guide here: https://www.jotform.com/help/233-How-To-Add-Coupon-Code-in-the-Payment-Form

I hope this helps. If you need further assistance please let us know. Thank you.