</pre>
//Redirect Contact Form 7 to custom thank you page
add_action( 'wp_footer', 'redirect_cf7' );
function redirect_cf7() {
echo '<script type="text/javascript">
document.addEventListener( "wpcf7mailsent", function( event ) {
if ( "form_id" == event.detail.contactFormId ) {
location = "link";
}
}, false );
</script>';
}
<pre>