how can i creat a coupon ? Validation coupon

Gostaria de saber como faço para criar uma validação de cupom, igual

http://galeria.fabricadeaplicativos.com.br/big_pizza#gsc.tab=0

NA opção: " FAÇA AQUI SEU PEDIDO"

OBRIGADO.

We have a Coupon Code feature that you can use to your Forms.

user guide: -How-To-Add-Coupon-Code-in-the-Payment-Form

OR

If you are instead looking for way make use a coupon code like validation to how your form will be used, then you can make use of the Condition Logic in the form.

user guide: -Smart-Forms-Using-Conditional-Logic

Hope this help. Let us know if you need further assistance.

Thanks.