Summary: 

Here we have to add a custom checkbox from WooCommerce checkout based on a product ID

Solution:

Explanation:

• The is_in_cart() function checks if any of the specified product IDs are present in the WooCommerce cart. If found, it returns true; otherwise, it returns false.

• The checkout_shipping_form_packing_addition() function is hooked to the woocommerce_after_checkout_billing_form action with a priority of 20. This means it will be executed after the billing form is rendered.

• Inside checkout_shipping_form_packing_addition(), it first checks if a specific product ID (15163) is present in the cart using is_in_cart(). If the product is present, it exits the function, preventing further execution.

• If the product is not in the cart, it proceeds to echo HTML to display a custom checkbox field labeled "სამაჯური" (translation: Packing) with a description and a price.

• The checkbox field allows users to select whether they want to purchase a packing service for an additional fee.

• The value of the checkbox field is retrieved from the WooCommerce session using WC()->session->get('chosen_packing'), which allows the checkbox to retain its state if the user navigates away from the page and returns.

Overall, this code dynamically adds a checkbox field to the WooCommerce checkout page based on the presence of a specific product in the cart, providing users with the option to purchase an additional service.

Answered by: >LoicTheAztec

Credit:> StackOverflow

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