To display coupons used on order detail and order notification, along with the percentage discount, you can use this code snippet:

PHOTO EMBED

Fri Feb 18 2022 10:30:44 GMT+0000 (Coordinated Universal Time)

Saved by @hsmith1947 #php

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 )
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