Change Mycred Display name

add_filter( 'mycred_parse_tags_user', function ( $content, $user, $data ) {

    if ( ! is_object( $user ) && is_array( $user ) )
        $user = (object) $user;

    if ( ! isset( $user->ID ) ) return $content;

    $profile_url = mycred_get_users_profile_url( $user->ID );
    $display_name = $user->display_name;

    if(class_exists('PeepSoUser')){
        $peepso_user = PeepSoUser::get_instance($user->ID);
        $display_name = $peepso_user->get_fullname();
    }

    $content     = str_replace( '%user_profile_link%',  '<a href="' . esc_url_raw( $profile_url ) . '">' . esc_attr( $display_name ) . '</a>', $content );

    return $content;

}, 10, 3);