I need clarification please.

1.By "full stack purchase" do you mean "5 codes here on appsumo"?

2. To give a customer a button, they'll have to use my same email login that I use to create my button? So they'll be able to see every other customers button?

3. I won't be able to revoke access to a customer's button because they have the same access as me with my login?

4. I want to be able to give a customer a button without them using my same login. Don't want them to be able to change or see anyone else's button. I understand they'll see the name "contact button" on the branding, I'm fine with that part

Please clarify so I can know if this meets my needs. Thanks