I want create bigbluebutton webhoock, but "checksum" it's not correct
<?php
$urljoin ="https://server1.example.com/bigbluebutton/api/hooks/create?";
$params ='callbackURL=' .urlencode('http://example.net');
echo $urljoin.$params.'&checksum='.sha1('create'.$params.'S8BFPSCuY6XTghtr3iuNrOJhCKMJEV0W0dkfppjow');
}
please guide me thanks