Hey. I'm in charge of Developer Relations at PAYMILL. I'm sorry to read that you are having difficulties with the service.
What do you mean with "Requests for updates are ignored"?
The current documentation has been around for a while and is currently being entirely updated. I would be happy to hear your thoughts to ensure the new version will be satisfying for our users.
You're more than welcome to write a guest post about security on our blog if you'd like to :)