Coupon Code development on biznessapps.com

Currently, I've build the mobile apps using biznessapps.com. Everything is ok but they need COUPON CODE for the mobile shopping module which the system do not have. See attachment: Basically, when the coupon code that generated via by our e-commerce system, they need to check the database from e-commerce and deduct the amount or percentage off from the price purchase via the mobile apps. I have contact the [login to view URL] , they do not offer customized programming service. Ask us to source ourselves to input into the system. Below is their response: They would have to build your custom feature using HTML5. This feature can then be implemented using a website tab, or the code itself can be inputted into an info-tier tab using the HTML editor. If you have experience dealing with [login to view URL] add-on, please contact me asap.