Add coupon names and percentage to WooCommerce view order details and email notifications

Question

I used Add the Coupon Code names to Woocommerce View Order details and email notifications to inspire my snippet.

I'm trying to expand the snippet to also include the coupon percentage amount in brackets, if the coupon type is a percentage discount.

This is what it should look like:

Here is my attempt. Any ideas if this is correct:

add_filter( 'woocommerce_get_order_item_totals', 'add_coupons_codes_line_to_order_totals_lines', 10, 3 );
function add_coupons_codes_line_to_order_totals_lines( $total_rows, $order, $tax_display ) {
    // Exit if there is no coupons applied
    if( sizeof( $order->get_used_coupons() ) == 0 )
        return $total_rows;

    $new_total_rows = []; // Initializing

    foreach($total_rows as $key => $total ){
        $new_total_rows[$key] = $total;

        if( $key == 'discount' ){
            // Get applied coupons
            $applied_coupons = $order->get_used_coupons();
            
        if( $applied_coupons->discount_type == 'percent'){
             // Get applied coupon percentge
            $applied_coupons_percentage = $applied_coupons->coupon_amount;
            }

            // Insert applied coupon codes in total lines after discount line
            $new_total_rows['coupon_codes'] = array(
                'label' => __('Applied coupons:', 'woocommerce'),
                'value' => implode( ', ', $applied_coupons '<p> ({$applied_coupons_percentage}%)</p>' ),
            );
        }
    }

    return $new_total_rows;
}

I use this to display the coupon percentage on the cart page. I tried to incorporate this into my snippet above:

function my_coupon_percentage_cart($value, $coupon)
{
    if($coupon->discount_type == 'percent' && !empty($coupon->coupon_amount))
    {
        $amt = "<br><br><p><em><strong>{$coupon->coupon_amount}% OFF on Your Order</strong></em></p>";   
    }

    return $value.$amt;
}
add_filter('woocommerce_cart_totals_coupon_html','my_coupon_percentage_cart',10,2);

Answer 1

Besides the fact that your code contains mistakes, it also contains some outdated code

• get_used_coupons() is deprecated since 3.7.0 - Replaced with better named method to reflect the actual data being returned.
• $coupon->discount_type has been replaced with $coupon->get_discount_type()
• $coupon->coupon_amount has been replaced with $coupon->get_amount()

So you get:

function filter_woocommerce_get_order_item_totals( $total_rows, $order, $tax_display ) {
    // Exit if there is no coupons applied
    if ( sizeof( $order->get_coupon_codes() ) == 0 ) return $total_rows;

    $new_total_rows = []; // Initializing

    foreach( $total_rows as $key => $total ) {
        $new_total_rows[$key] = $total;

        if ( $key == 'discount' ) {
            // Get used coupon codes only
            $coupon_codes = $order->get_coupon_codes();
            
            // Loop through WC_Order_Item_Coupon objects
            foreach ( $coupon_codes as $index => $coupon_code ) {
                // Get an instance of the WC_Coupon Object
                $coupon = new WC_Coupon( $coupon_code );

                // Discount type = percent & amount NOT empty
                if ( $coupon->get_discount_type() == 'percent' && ! empty ( $coupon->get_amount() ) ) {
                    $coupon_codes[$index] = $coupon_code . ' (' . $coupon->get_amount() . '%)';
                }
            }
            

            // Insert applied coupon codes in total lines after discount line
            $new_total_rows['coupon_codes'] = array(
                'label' => __( 'Applied coupons:', 'woocommerce' ),
                'value' => implode( ', ', $coupon_codes ),
            );
        }
    }

    return $new_total_rows;
}
add_filter( 'woocommerce_get_order_item_totals', 'filter_woocommerce_get_order_item_totals', 10, 3 );