Create a custom shortcode for email / confirmation or other after form submit

custom_shortcode_in_fluentforms.php

<?php

/*
 * Create a custom shortcode for email / confirmation or other after form submit
 * Usage: {my_custom_shortcode}
 * @param $value string original shortcode string
 * @param $parser class \FluentForm\App\Services\FormBuilder\ShortCodeParser
 */
add_filter('fluentform_shortcode_parser_callback_my_custom_shortcode', function ($value, $parser) {

    // If you need $submittedData
    $entry = $parser::getEntry();
    $submittedData = \json_decode($entry->response, true);
  
    // if you need form ID
    $formId = $entry->form_id;

    
    return 'my custom value';
}, 10, 2);