php - Applied coupons disable Free shipping conditionally in Woocommerce

Question

I am trying to get it so that if a customer were to add a coupon code (Any of them) the Free Shipping option would go away and the flat rate fee would be implemented. - You would think this would be an easy thing to implement, there would be 100's of plugins and ways described to do this, but I have not found any. I do not want to pay $89 for the plugin to do this one thing

A side bonus would be if they are using a coupon but are spending over $249 they can still qualify for Free shipping. I read some where how to do this, but it requires me to get the POST ID, which with the latest WooCommerce is not possible like it was before, I do not know the shipping ID so I am at a lost Here is the code

add_filter( 'woocommerce_shipping_packages', function( $packages ) {
$applied_coupons = WC()->session->get( 'applied_coupons', array() );
if ( ! empty( $applied_coupons ) ) {
$free_shipping_id = 'free_shipping:2';
unset($packages[0]['rates'][ $free_shipping_id ]);
}
return $packages;
} );

Thanks

Edited

add_filter( 'woocommerce_package_rates', 'coupons_removes_free_shipping', 
10, 2 );
function coupons_removes_free_shipping( $rates, $package ){
if ( is_admin() && ! defined( 'DOING_AJAX' ) )
    return $rates;

$min_total      = 250; // Minimal subtotal allowing free shipping

// Get needed cart totals
$total_excl_tax = WC()->cart->get_total();
$discount_excl_tax = WC()->cart->get_discount_total();


// Calculating the discounted subtotal including taxes
$discounted_subtotal_incl_taxes = $total_excl_tax - $discount_excl_tax;

$applied_coupons   = WC()->cart->get_applied_coupons();

if( sizeof($applied_coupons) > 0 &&  $discounted_subtotal_incl_taxes < $min_total ) {
    foreach ( $rates as $rate_key => $rate ){
        // Targeting "Free shipping"
        if( 'free_shipping' === $rate->method_id  ){
            unset($rates[$rate_key]);
        }
    }
}
return $rates;

}

Answer 1

The below code will enable "Free shipping" for applied coupons only if cart subtotal reaches a minimal amount (discounted including taxes):

add_filter( 'woocommerce_package_rates', 'coupons_removes_free_shipping', 10, 2 );
function coupons_removes_free_shipping( $rates, $package ){
    if ( is_admin() && ! defined( 'DOING_AJAX' ) )
        return $rates;

    $min_subtotal      = 250; // Minimal subtotal allowing free shipping
    
    // Get needed cart subtotals
    $subtotal_excl_tax = WC()->cart->get_subtotal();
    $subtotal_incl_tax = $subtotal_excl_tax + WC()->cart->get_subtotal_tax();
    $discount_excl_tax = WC()->cart->get_discount_total();
    $discount_incl_tax = $discount_total + WC()->cart->get_discount_tax();
    
    // Calculating the discounted subtotal including taxes
    $discounted_subtotal_incl_taxes = $subtotal_incl_tax - $discount_incl_tax;
    
    $applied_coupons   = WC()->cart->get_applied_coupons();

    if( sizeof($applied_coupons) > 0 && $discounted_subtotal_incl_taxes < $min_subtotal ){
        foreach ( $rates as $rate_key => $rate ){
            // Targeting "Free shipping"
            if( 'free_shipping' === $rate->method_id  ){
                unset($rates[$rate_key]);
            }
        }
    }
    return $rates;
}

Code goes in function.php file of your active child theme (or active theme). Tested and work.

---

Original answer:

The below code will remove "Free shipping" shipping methods when any coupon is applied without any settings need. There is some mistakes in your actual code. Try the following:

add_filter( 'woocommerce_package_rates', 'coupons_removes_free_shipping', 10, 2 );
function coupons_removes_free_shipping( $rates, $package ){
    if ( is_admin() && ! defined( 'DOING_AJAX' ) )
        return $rates;

    $applied_coupons = WC()->cart->get_applied_coupons();

    if( sizeof($applied_coupons) > 0 ){
        // Loop through shipping rates
        foreach ( $rates as $rate_key => $rate ){
            // Targeting "Free shipping" only
            if( 'free_shipping' === $rate->method_id  ){
                unset($rates[$rate_key]); // Removing current method
            }
        }
    }
    return $rates;
}

Code goes in function.php file of your active child theme (or active theme). Tested and works.