Customers able to get the product for zero

that can easily be done by using inspector in browser.
i did one such order:
check this

• This reply was modified 3 years, 8 months ago by joydipkar73.

Okay @moomooagency I have found out how this is happening. Basically it if the customer clicks “add to cart” in the product categories pages.
how can i sort this issue?
https://prnt.sc/10z3o35

• This reply was modified 3 years, 8 months ago by kennett.
• This reply was modified 3 years, 8 months ago by kennett.

@joydipkar73 what do you mean?

you can hide the button using woocommerce or cpo setting

@kennett please, try switching to storefront and check that page; Uni CPO disables such button in archives by default for products configured with Uni CPO. However, of course you or your theme developer or some page builder may add such links. So, please, check if this is the case.

where can you hide it in CPO settings?

Uni CPO doesn’t hide it, but changes add to cart url to simply product url and changes text to ‘select options’ automatically; there is no setting dedicated to this because you must not be able to revert the changes.

well its not changing the add to cart url to the single product page. i have tried changing to storefront and disabling plugins

Strange. Please, show how it works for you. Switch to Storefront and give a link.