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How can I access the form data during or after submission?

Am using Webform REST for the submission of forms, but I don't seem to be able to retrieve the form data.

For now, I tried the following which gives me empty results:

function module_webform_submission_form_alter(array &$form, \Drupal\Core\Form\FormStateInterface $form_state, $form_id) {
  \Drupal::logger("module.webform.data")->notice(json_encode($form_state, true));
}

I tried using HOOK form submit but it does not log anything at all. In fact, it looks like this hook is not triggered.

function module_webform_submit($form, \Drupal\Core\Form\FormStateInterface $form_state) {
  \Drupal::logger("module.webform.form_state")->notice(json_encode($form_state, true));
} 

How can I access the form data during or after submission?

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