Call action on submit wpcf7 form

functions.php

<?php
add_action( 'wpcf7_submit', function( $contact_form, $result ) {
	if ( empty( $result['status'] )	|| 'mail_sent' != $result['status'] ) {
		return;
	}
	
	$submission = WPCF7_Submission::get_instance();
	if ( ! $submission || ! $posted_data = $submission->get_posted_data() ) {
		return;
	}
	echo '<pre>';
	print_r( $posted_data );
	echo '</pre>';
	exit;
}, 10, 2 );