Custom free shipping calculated rate cost in Woocommerce 3 - php

Question

I am having an issue with applying this filter at checkout. the below code works as expected on the cart page, the labels for the shipping methods each update if the specified criteria (in this case "free_shipping") are met.
add_filter( 'woocommerce_package_rates', 'my_custom_shipping', 100, 2 );
function my_custom_shipping( $rates, $package ) {
$percentage = 0.01;
foreach($rates as $key => $rate ) {
$test_method_id = $rates[$key]->method_id;
if ( $test_method_id === "free_shipping" ){
$surcharge = ( wc()->cart->cart_contents_total + $rates[$key]->cost ) * $percentage;
$rates[$key]->label .= " Fee: {$surcharge}";
$rates[$key]->cost += $surcharge;
}
}
return $rates;
}// Function END
while this works fine on the cart page (but only with debug mode active, nothing loads when debug mode is turned off which is very frustrating), on the checkout page the changes do load briefly ( i can scroll down and see them ) but they are quickly overwritten with the original labels. I cannot seem to figure out why, I thought setting the filter to call later might help but it does not seem to.
all the data is there and I can output and see it but it simply does not apply in a permanent way at checkout, why would this be happening?

Answer 1

You can't really get an initial cost for "free shipping" rate as there is not any cost field for "Free shipping" method in backend.
But you can add a calculated cost and change the label (differently):
add_filter( 'woocommerce_package_rates', 'custom_shipping_rates', 100, 2 );
function custom_shipping_rates( $rates, $package ) {
$cc_total = WC()->cart->cart_contents_total;
$percentage = 0.01; // 1%
foreach( $rates as $rate_key => $rate ) {
if ( 'free_shipping' === $rate->method_id ){
// Calculation
$surcharge = $cc_total * $percentage;
// Set the new Label name
$rates[$rate_key]->label .= ' ' . __("Fee", "woocommerce");
// Set Custom rate cost
$rates[$rate_key]->cost = round($surcharge, 2);
}
}
return $rates;
}
Code goes in function.php file of your active child theme (or active theme). Tested and works
You should need to refresh the shipping caches:
1) First this code is already saved on your function.php file.
2) In Shipping settings, enter in a Shipping Zone and disable a Shipping Method and "save". Then re-enable that Shipping Method and "save". You are done.
Update: (Force clearing shipping methods from WC_Session):
add_filter( 'woocommerce_package_rates', 'custom_shipping_rates', 100, 2 );
function custom_shipping_rates( $rates, $package ) {
// Reset session
WC()->session->set('shipping_for_package_0', array('package_hash' => ''));
$cc_total = WC()->cart->cart_contents_total;
$percentage = 0.01; // 1%
foreach( $rates as $rate_key => $rate ) {
if ( 'free_shipping' === $rate->method_id ){
// Calculation
$surcharge = $cc_total * $percentage;
// Set the new Label name
$rates[$rate_key]->label .= ' ' . __("Fee", "woocommerce");
// Set Custom rate cost
$rates[$rate_key]->cost = round($surcharge, 2);
}
}
return $rates;
}
Code goes in function.php file of your active child theme (or active theme). It could works…