Lonsdale201

// place the code in the child theme functions.php or a custom code snippets plugin, like FluentSnippets
// What do this code

// What this Call hook does is to extract the product identifier from the field that is filled, 
// and the order quantity from the quantity field. It checks when the form is submitted 
// if there is enough of the product in stock, if so, it subtracts the quantity when the form is submitted. 
// If there is not enough, an error is generated and the stock of the product is not changed.

// This code does not require the JFB Add to cart add-on. The hook does not go through the checkout process, 
// it only adjusts the stock of the product based on the quantity of the order the user has submitted.