Redirect agents to ticket admin when they login via the Ticket Manager front end

redirect-agent-login.php

<?php

/**
 * Redirect agents to the ticket admin screen.
 *
 * Effective when agents login via the KBS front end login form.
 *
 * @param   string  $redirect_to    The redirect URL
 * @param   int     $user_id        ID of user logging in
 * @return  string  Redirect URL
 */
function kbs_agent_redirect_to_admin_ticket_screen( $redirect_to, $user_id )    {
    if ( kbs_is_agent( $user_id ) ) {
        $redirect_to = add_query_arg( array( 
            'post_type' => 'kbs_ticket'
        ), admin_url( 'edit.php' ) );
    }

    return $redirect_to;
}
add_filter( 'kbs_login_redirect', 'kbs_agent_redirect_to_admin_ticket_screen', 10, 2 );