Add Discount Type in Woocommerce Coupon
Request:
My Client want to add “Diskon Ongkir” in Coupon type like image below

Question :
How to do that … ?
Reply:
Go to your functions.php in themes folder and add this code:
function custom_discount_type( $discount_types ) {
$discount_types['diskon_ongkir'] =__( 'Diskon Ongkir', 'woocommerce' );
return $discount_types;
}
add_filter( 'woocommerce_coupon_discount_types', 'custom_discount_type',10, 1);