Reset previous chosen shipping method in Woocommerce checkout page

Currently, I am clearing the default shipping selection method using this filter:

add_filter( 'woocommerce_shipping_chosen_method', '__return_false', 99);

However, this only clears it during the initial session of the customer. Once the customer chooses an option even once, it remembers the selection for the future.

I am trying to get the checkout to force the customer to pick a shipping option every time they visit the checkout even in the same session. Is it possible to run this filter every time the checkout page is loaded?

Solution 1:

You can reset the last chosen shipping method using in checkout page (for logged in customers):

 delete_user_meta( get_current_user_id(), 'shipping_method' );

And also remove the chosen shipping method from session data:

WC()->session->__unset( 'chosen_shipping_methods' );

In a hooked function like:

add_action( 'template_redirect', 'reset_previous_chosen_shipping_method' );
function reset_previous_chosen_shipping_method() {
    if( is_checkout() && ! is_wc_endpoint_url() && is_user_logged_in() 
    && get_user_meta( get_current_user_id(), 'shipping_method', true ) ) {
        delete_user_meta( get_current_user_id(), 'shipping_method' );
        WC()->session->__unset( 'chosen_shipping_methods' );
    }
}

Or you can also set a default shipping method for everybody in checkout page:

add_action( 'template_redirect', 'reset_previous_chosen_shipping_method' );
function reset_previous_chosen_shipping_method() {
    if( is_checkout() && ! is_wc_endpoint_url() && is_user_logged_in() ) {
        WC()->session->set( 'chosen_shipping_methods', array('flat_rate:14') );
    }
}

To find out the shipping methods rate Ids to be used, you can inspect the shipping method radio buttons in cart or checkout pages, with your browser inspector like:

Code goes on function.php file of your active child theme (or active theme). It should works.