We do change and sell metal too. Legally, if a customer buys metal, he is not allowed to buy currencies, and reverses.
That's why we need an update on the theme, that disallow add to cart "currency" category products if you have category "metal" product in cart. And off course that disallow add to cart "metal" category product, if you have in cart category "currency" product.
A snippet from stackoverflow exists, and seem do what I need, just need to be adapted and corrected : [login to view URL]
Hi Mike, I understand the tasks and I can complete it within 02 working days. Please provide me with the website credentials. Thanks and regards, Ha Nguyen