Payment in a frame, is it safe?

Question

Information Security

Then, while crawling on the Internet, I came across a payment gateway company that accepts card data simply in a frame, without transferring it to its gateway under https.
In this case, the site on which the frame is inserted is loaded via http.
Now I'm wondering how normal this is.

Answer 1

If the frame itself is without https, then you should not enter payment data there

Answer 2

The site itself doesn't matter.
The main thing is that the payment frame is via https