How get post id?

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I have function like this, but I dont now how I can get post id… Can you help me?
Contact form I have in modal popup.

function cf7dynamicnotifications($contact_form)
{
	$submission = WPCF7_Submission::get_instance(); 

	$post_id = $submission->get_meta('container_post_id');

	$newmail = get_field('email', $post_id);

   	$mailProp = $contact_form->get_properties('mail');
   	$mailProp['mail']['recipient'] = $newmail;

   	$contact_form->set_properties(array('mail' => $mailProp['mail']));

}

add_action( 'wpcf7_before_send_mail', 'cf7dynamicnotifications');

• This topic was modified 46 minutes ago by mariuszm.