myCRED Payout based on Woo Product Variation

/**
 * Award Points on Order Completed
 * Award 100 points for each license a user purchases.
 * Licenses are a product variation.
 * @version 1.0
 */
add_action( 'woocommerce_order_status_completed', 'mycred_pro_award_based_on_variation' );
function mycred_pro_award_based_on_variation( $order_id ) {

    // Make sure myCRED is installed
    if ( ! function_exists( 'mycred' ) ) return;

    $order = new WC_Order( $order_id );

    $items = $order->get_items();

    $payout = 0;

    // Loop though the order items to count licenses
    foreach ( $items as $item ) {

        // Only applicable for products that have the variation "pa_license"
        if ( ! isset( $item['pa_license'] ) ) continue;

        if ( $item['pa_license'] == 'single-site-license' )
            $number = 1;
        elseif ( $item['pa_license'] == '5-site-licenses' )
            $number = 5;
        elseif ( $item['pa_license'] == '10-site-licenses' )
            $number = 10;
        else
            $number = 1;

        $payout = $payout + ( $number * 100 );

    }

    if ( $payout > 0 ) {

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

        if ( ! $mycred->exclude_user( $order->user_id ) )
            $mycred->add_creds(
                'store_reward',
                $order->user_id,
                $payout,
                'Store purchase reward',
                $order_id,
                array( 'ref_id' => 'post' ),
                $point_type
            );

    }

}