Woocommerce product custom price is not accepted by woocommerce coupon - wordpress

Question

In our woocommerce shop , customer can enter the custom width and height of the product and product price calculated based on this details .
For example if the initial price for a product is 50 . And customer add width =2, height=3 , then the price for this product is going to 50*2*3=300
for this we are using following code
// Save custom field value in cart item as custom data
add_filter( 'woocommerce_add_cart_item', 'calculate_custom_cart_item_prices', 30, 3 );
function calculate_custom_cart_item_prices( $cart_item_data, $product_id, $variation_id ) {
if ( isset($_POST['width']) && isset($_POST['height']) ) {
// Get the correct Id to be used (compatible with product variations)
$the_id = $variation_id > 0 ? $variation_id : $product_id;
$product = wc_get_product( $the_id ); // Get the WC_Product object
$product_price = (float) $product->get_price(); // Get the product price
// Get the posted data
$width = (float) sanitize_text_field( $_POST['width'] );
$height = (float) sanitize_text_field( $_POST['height'] );
$new_price = $width * $height * $product_price; // Calculated price
$cart_item_data['calculated-price'] = $new_price; // Save this price as custom data
}
return $cart_item_data;
}
// Set custom calculated price in cart item price
add_action( 'woocommerce_before_calculate_totals', 'set_calculated_cart_item_price', 20, 1 );
function set_calculated_cart_item_price( $cart ) {
if ( is_admin() && ! defined( 'DOING_AJAX' ) )
return;
// Loop through cart items
foreach ( $cart->get_cart() as $cart_item ){
if( ! empty( $cart_item['calculated-price'] ) ){
// Set the calculated item price (if there is one)
$cart_item['data']->set_price( $cart_item['calculated-price'] );
}
}
And it is wormking , but the problem is:
when customer apply a 50% coupon code for this product then the
discount is coming as 25 , because it calculating based on 50*(50/100)=25;
But actually product new price is 300, so the discount should be
300*(50/100)=150;

Answer 1

Try updating your 'calculate_custom_cart_item_prices' function to something like this and see if that helps.
add_filter( 'woocommerce_add_cart_item', 'calculate_custom_cart_item_prices', 30, 2 );
function calculate_custom_cart_item_prices( $cart_item_data, $cart_item_key ) {
if ( isset($_POST['width']) && isset($_POST['height']) ) {
// Get the correct Id to be used (compatible with product variations)
$the_id = $cart_item_data['variation_id'] > 0 ? $cart_item_data['variation_id'] : $cart_item_data['product_id'];
$product = wc_get_product( $the_id ); // Get the WC_Product object
$product_price = (float) $product->get_price(); // Get the product price
// Get the posted data
$width = (float) sanitize_text_field( $_POST['width'] );
$height = (float) sanitize_text_field( $_POST['height'] );
$new_price = $width * $height * $product_price; // Calculated price
$cart_item_data['calculated-price'] = $new_price; // Save this price as custom data
}
return $cart_item_data;
}
My guess as to what is happening is a change in Woocommerce has changed the way the 'woocommerce_add_cart_item' filter works and so you need to update this function.