fulcrm_apiv2/fulcrm_apiv2.install

<?php /* -*- php -*- */

function fulcrm_apiv2_install() {
    try {
        $url = $GLOBALS[ 'base_url' ];
        $url = parse_url( $url, PHP_URL_HOST );
        $url = explode( '.', $url );
        $url = array_reverse( $url );
    } catch ( Exception $e ) {
        $url = array();
    }

    $url[] = fulcrm_uuid_uuid4();
    $url = implode( '.', $url );
    variable_set( 'fulcrm_apiv2_client_id', $url );
}