Change Donor Count

/**

 * In this example, the donor count is changed for a specific campaign

 * with an ID of 123. The donor count is incremented by 45.

 */

add_filter( 'charitable_campaign_donor_count', function( $count, $campaign ) {

    if ( 123 === $campaign->ID ) {

        $count += 45;

    }

    return $count;

}, 10, 2 );