Another day another Grok interaction.
The shopping cart is done with a plugin form rather than inline
Today I started to have more 2 way interaction with Grok, asking it for debug probe hints and with those I was able to diagnose the problem and feed the issue back to Grok
This is nearly ready for prime time. And you can check it out.
It is running in TEST mode so you can add items go to checkout and "pay" using a test card # 4242 4242 4242 4242 other fields ignorred
Almost ready for prime time, here is the README.md file