function switch_object_type() {

    if ( isset( $_GET['type'] ) && $_GET['type'] == 'affiliate' ) {

        add_filter( 'wpf_crm_object_type', function( $object_type ) {
            return 2; // no idea what this should be
        } );

    }

}

add_action( 'wp_ajax_nopriv_wpf_add_user', 'switch_object_type', 5 );