This has nothing to do specifically with Glide. This is just a reality of the web. There is a big difference between linking to a web page, and trying to iframe embed it in another web page. There are a lot of security implications that come along with it, along with trying to prevent phishing websites from tricking people into thinking they are on a legitimate website, and overall just trying to protect intellectual property. So that’s why many sites don’t allow their web pages to be iframe embedded into other web pages. I highly doubt Stripe will budge on that fact simply because of the nature of their business, but it doesn’t hurt to ask them.
From the Glide Docs:
Yes, it is possible to use both methods. URL is obviously very easy. I’ve used a small bit of javascript in a javascript column to convert raw HTML into a datauri which can be viewed in a web embed. Also I don’t remember for sure, but you may or may not be able to use the full iframe wrapped html as well. Not a method I’ve used, but I seem to recall that it was possible. So there are at least two…maybe three different methods possible.