How Can I Design a Bank?

[KazutoGekko]

Hello! Sorry, the situation is this, I saw a plugin called "Theonia Regional Bank" a while ago and I liked it a lot, but I see that the creator deleted it from the store, so I would like to create a similar (and improved) one but no I know where to start to make the interface, since I only know how to make plugins for monuments and nature
Could someone teach me how to make an interface?

[Hadestia]

If you did, you still can't, it requires a trusted plugin creator code for it to run, i deleted the plugin because it faced major issues, the code probably, but i got a new frames btw and waiting for myself to get a courage to remaster it