Buy 3 get 1 in WooCommerce PHP snippet

I want to implement a Buy 3 or more - Get 1 for free in WooCommerce with a PHP snippet. How can i achieve this?

1. All products are part of this
2. 1 of the lowest price product is free
3. Does not matter what product it will be

https://stackoverflow.com/questions/66739164/buy-3-get-1-in-woocommerce-php-snippet March 22, 2021 at 09:06AM