Reward Woo Order with 2 Points / Product

/**
 * Pay 2 Points / Product
 * Rewards a buyer with 2 points per product they purchase
 * using WooCommerce.
 * @version 1.0
 */
add_action( 'woocommerce_payment_complete', 'mycred_pro_add_points_for_product_purchase' );
function mycred_pro_add_points_for_product_purchase( $order_id ) {

    if ( ! function_exists( 'mycred' ) ) return;

    $order = wc_get_order( $order_id );
    if ( $order->order_total == 0.00 || $order->order_total == 0 || $order->payment_method == 'mycred' ) return;

    $point_type = 'mycred_default';
    $mycred = mycred( $point_type );

    if ( $mycred->has_entry( 'shopping_reward', $order_id, $order->user_id ) ) return;

    // Calculate reward
    $reward = 0;
    $items = $order->get_items();
    foreach ( $items as $item ) {
        $reward += 2 * $item['qty'];
    }

    // Add reward
    $mycred->add_creds(
        'shopping_reward',
        $order->user_id,
        $reward,
        'Reward for store purchase',
        $order_id,
        array( 'ref_type' => 'post' ),
        $point_type
    );

    $message = '%s points paid as reward';
    $message = str_replace( '%s', $mycred->format_creds( $reward ), $message );

    $order->add_order_note( $message, 1 );

}