Hi, I do not understand quite well what you mean. How can I set a limit to the amount so the COD is not shown if the amout is higher than this?

Also I have been checking, and the COD Fee is adding to the total strange numbers. Shipping and subtotals are added to the total correctly, including 2 decimals, except for Cod Fee.
When it is a % it adds the integer. But I realized that when the % is less than 3, it was minimum 3.00 (remember the rule) and it shows correctly 3, but adds 4. This is a nonsense.

The thing is that the Cod Fee is shown correctly on Payment Method and Confirm Order pages, also on the admin on the invoice etc, but the total amount is what is wrong.
If the data of Cod Fee is shown correctly on the screen, that means that the added code to allow % is working fine, as it calculates ok the amount, but it is just on Total where it adds the amount wrong.
Where is the file which tells the total which quantities have to pick up to make the calculation? Just to have a look at this to see if there is something wrong, and compare with the original ZenCart file to check if something has been modified.

At the beginning, on those screens there were something odd, the tax was calculated twice, so finally they managed to fix this, but maybe they touch something else that is making the COD Fee working in a strange way.

Thanks for your efforts.