How to set up JWT authentication for payment discounts?

Hey,

I am trying to setup a payment discount with encoding via JWT as we registered with the Piiink service.

What we need to setup is detailed here: https://www.piiink.org/docs/integration

Our website is www.zigzagstore.com.au that we wish to implement.

Is anyone able to assist or direct me to someone who is able to assit?

Thanks in advance.

Ryan