Small script to extract/import XLIFF from WPML with code for Wordpress translation

automate-wpml.php

<?php

require_once('wp-load.php');
require_once('wp-content/plugins/sitepress-multilingual-cms/inc/wpml-private-actions-tm.php');

use WPML\TM\AutomaticTranslation\Actions\Actions;

define( 'WP_DEBUG', true );
error_reporting(E_ALL);

function get_post_xliff($source_language, $post_id, $target_language) {
    // We first create a translation job
    global $sitepress;
    $factory = new WPML_Translation_Element_Factory($sitepress);
    $helper = new Actions($factory);
    $res = $helper->createNewTranslationJobs($source_language, [[$post_id, $target_language]]);

    // And then get the job's XLIFF
    return wpml_tm_get_job_xliff($res[0]['jobId']);
}

function import_xliff_translation($xliff_content) {
    $factory = wpml_tm_load_job_factory();
    $reader = new WPML_TM_General_Xliff_Reader($factory);
    $data = $reader->get_data($xliff_content);
    wpml_tm_save_data($data, false);
}

// Export the XLIFF for a job
$post_xliff_content = get_post_xliff('en', 1, 'fr');

// Import the translated XLIFF
import_xliff_translation(file_get_contents('translation.xliff'));