Upgrading to Plus / Custom HTML, CSS, Javascript in 2025 site builder?

[erdecasa]

I understand that Square acquired Weebly and integrated its site builder recently.
The other posts on this topic I saw were several years old, so I have a couple questions about the newest site builder:

1. If I upgrade to Plus, will I get full control of HTML, CSS, and JavaScript? If not, how much control will I have?

2. Does Premium offer more control than Plus?
   
   

I currently have a Squarespace site and want to customize my Square site to look identical to the Squarespace site.

Also, is it possible to embed a Square checkout page in an iframe to keep customers on the same site without redirecting?

Thanks!

[erdecasa · Accepted solution]

I'll answer my own question here for any one interested in the future:
You can have custom HTML, CSS, and Javascript for your site with a free account.

To do this, you will need to use the Square API. See https://developer.squareup.com/docs/snippets-api/add-a-snippet

This documentation page has info on how to upload a "snippet" which is a string that contains all the custom html, css, and javascript that you would like to add to your square page.

The caveat is that your snippet will be active on every page of the square site automatically, except for the checkout page.
It seems only a single snippet can be active at a time, but the character limit on the snippet string itself is something like 65,000+ characters.