My business email is bjw@ketolish.us which is where my orders come in and everything else is automated. Not thru Proton. I was just giving you that email if you wanted to order E2EE using your own Proton email address, but now I see you're trying to advertise a service. I have had a bunch of that stuff sent to me by people, and most of it goes over my head. I'm just an over 50's old lady who builds websites/monitors a web server by day, and on the side. makes jerky & trades it for bitcoin and ships it in the mail 🤷‍♀ But feel free to send how to implement it to my above email.