Hi,
After some research you can do something like that:
add_action('wpcf7_before_send_mail', 'call_after_for_submit');
function call_after_for_submit($contact_data)
{
include_once(rtrim(JPATH_ADMINISTRATOR, DIRECTORY_SEPARATOR).DIRECTORY_SEPARATOR.'components'.DIRECTORY_SEPARATOR.'com_acym'.DIRECTORY_SEPARATOR.'helpers'.DIRECTORY_SEPARATOR.'helper.php');
$userClass = acym_get('class.user');
$myUser = $userClass->getOneByEmail(strip_tags($postData['RSEProEmail']));
if (empty($myUser)) {
$myUser = new stdClass();
}
$myUser = new stdClass();
$myUser->email = strip_tags($post['your-email-field']); // Email field
$myUser->name = strip_tags($post['your-email-field']); // Name field
$myUser->id = $userClass->save($myUser, $customFields);
$listToSubscribe = [1, 4]; // id of your lists separeted by commas
$userClass->subscribe($myUser->id, $listToSubscribe);
$userClass->sendConfirmation($myUser->id);
}
I'm not 100% sure of this code make sure to test it in a test environment.