When a field includes an additional charge, please ensure that a corresponding add-on product has been created in the Shopify Admin to represent this charge.
If you encounter an error when the additional charge is expected in the cart, it likely means something was missed during the setup process.missing while setting up this additional charge.
The add-on product should meet the following criteria:
It must be in stock (check the inventory level).
It must be active in Shopify Admin.
It must be available in the Online Store sales channel.
Once all of these are confirmed, go back to the field and re-select the add-on product as the associated additional charge.
Status - Active
Publishing - Online Store
Inventory status - ALWAYS IN STOCK
If you use upsell apps like "Unlimited Bundles & Discount App" , it may conflict with our app and raise this error too.
We know that our app works perfectly fine with Kaching Bundle or Essential Upsell App.
