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$order = new WC_Order( $order_id );

$order_total_amount = $order->get_formatted_order_total();

$items = $order->get_items();

foreach ( $items as $item ) {
     $product_name= $item['name'];
    $product_id= $item['product_id'];

}

$_product = wc_get_product( $product_id );
$product_regular_price = $_product->get_regular_price();

$order_data = $order->get_data();
$order_date_created = $order_data['date_created'];
$order_o_total = $order_data['total'];
$order_discount_total = $order_data['discount_total'];
$order_total_tax = $order_data['total_tax'];

if($order->status === 'completed' ) {

    if( $order->get_used_coupons() ) {

        foreach( $order->get_used_coupons() as $coupon) {

            $coupon_name = $coupon;
            /* get coupon's details */
            $coupon_post_obj = get_page_by_title($coupon, OBJECT, 'shop_coupon');
            $coupon_id = $coupon_post_obj->ID;

            $coupons_obj = new WC_Coupon($coupon_id); /* get coupon instance */

            $coupon_discount_amount = $coupons_obj->get_discount_amount();
            $sales_representative_name          = get_post_meta( $coupon_id, 'sales_representative_name', true );
            $sales_representative_email_address = get_post_meta( $coupon_id, 'sales_representative_email_address', true );
        }

        $to = $sales_representative_email_address;
        $subject = 'New Order Completed Using Assigned Coupon Code';

        $headers  = 'MIME-Version: 1.0' . "rn";
        $headers .= 'Content-type: text/html; charset=iso-8859-1' . "rn";
        $headers .= 'From: My Name <nanganstella@gmail.com>' . "rn";

        $message = '<html><body>';
        $message .= '<h1>A new order has been completed using assigned coupon code.<br/></h1>';

        $message .= '<table rules="all" style="border-color: #666;" cellpadding="10">';

        $message .= '<tr><td><strong>Product</strong></td><td>'. $product_name .'</td></tr>';

        $message .= '<tr><td><strong>Coupons used</strong></td><td>'. $coupon_name .'</td></tr>';

        $message .= '<tr><td><strong>Date</strong></td><td>'. $order_date_created .'</td></tr>';

        $message .= '<tr><td><strong>Product Price</strong></td><td>'. $product_regular_price .'CFA</td></tr>';

        $message .= '<tr><td><strong>Order Discount </strong></td><td>'. $order_discount_total.'CFA</td></tr>';


        $message .= '<tr><td><strong>Order Tax</strong></td><td>'. $order_total_tax .'</td></tr>';

        $message .= '<tr><td><strong>Order Amount</strong></td><td>'. $order_total_amount .'</td></tr>';


        $message .= '</table>';
        $message .= '</body></html>';

        wp_mail( $to, $subject, $message, $headers );

    }
}