Paid to have an app built with AI — now I'm not sure how to tell if it was done right. Did you deal with this?

A few months back I paid someone to build an app for my business using AI tools. It works, and it looks fine.

But I've got this nagging feeling I can't shake: I have no real way to know if it was actually built properly underneath. I can't read the code. I don't know if my data is safe, or if there's something that could cost me later.

I basically just had to trust that it works.

For those of you who've had something built this way — did you run into the same feeling? Did you do anything about it, or just hope for the best?